[libafl_cc] Fix for LLVM opaque pointers in passes

LLVM began introducing opaque pointers (pointer types with purposefully
undefined pointee types) around LLVM 13[1] like in commit:

`2155dc51d700 ([IR] Introduce the opaque pointer type, 2021-05-01)`

introducing the function:

`PointerType::get(LLVMContext &C, unsigned AddressSpace)`

and had wholesale switched to only opaque pointers by LLVM 17[2].  Part
of that effort deprecates many functions, including:

`PointerType::get(Type *ElementType, unsigned AddressSpace)`

though this function was depreacted much later in LLVM 21 in
commit:

`146ad71bc71a ([IR] Deprecate PointerType::get/getUnqual pointee type overload (#134517), 2025-04-07)`

Switch libafl_cc's passes to the new function to avoid deprecation
warnings

[1]: https://releases.llvm.org/13.0.1/docs/ReleaseNotes.html#changes-to-the-llvm-ir
[2]: https://releases.llvm.org/22.1.0/docs/OpaquePointers.html#version-support

Author: rchildre3

crates/libafl_cc/src/autotokens-pass.cc

@@ -299,13 +299,11 @@ PreservedAnalyses AutoTokensPass::run(Module &M, ModuleAnalysisManager &MAM) {
           isStrcmp &=
               FT->getNumParams() == 2 && FT->getReturnType()->isIntegerTy(32) &&
               FT->getParamType(0) == FT->getParamType(1) &&
-              FT->getParamType(0) ==
-                  IntegerType::getInt8Ty(M.getContext())->getPointerTo(0);
+              FT->getParamType(0) == PointerType::get(M.getContext(), 0);
           isStrcasecmp &=
               FT->getNumParams() == 2 && FT->getReturnType()->isIntegerTy(32) &&
               FT->getParamType(0) == FT->getParamType(1) &&
-              FT->getParamType(0) ==
-                  IntegerType::getInt8Ty(M.getContext())->getPointerTo(0);
+              FT->getParamType(0) == PointerType::get(M.getContext(), 0);
           isMemcmp &= FT->getNumParams() == 3 &&
                       FT->getReturnType()->isIntegerTy(32) &&
                       FT->getParamType(0)->isPointerTy() &&
@@ -314,14 +312,12 @@ PreservedAnalyses AutoTokensPass::run(Module &M, ModuleAnalysisManager &MAM) {
           isStrncmp &=
               FT->getNumParams() == 3 && FT->getReturnType()->isIntegerTy(32) &&
               FT->getParamType(0) == FT->getParamType(1) &&
-              FT->getParamType(0) ==
-                  IntegerType::getInt8Ty(M.getContext())->getPointerTo(0) &&
+              FT->getParamType(0) == PointerType::get(M.getContext(), 0) &&
               FT->getParamType(2)->isIntegerTy();
           isStrncasecmp &=
               FT->getNumParams() == 3 && FT->getReturnType()->isIntegerTy(32) &&
               FT->getParamType(0) == FT->getParamType(1) &&
-              FT->getParamType(0) ==
-                  IntegerType::getInt8Ty(M.getContext())->getPointerTo(0) &&
+              FT->getParamType(0) == PointerType::get(M.getContext(), 0) &&
               FT->getParamType(2)->isIntegerTy();
           isStdString &= FT->getNumParams() >= 2 &&
                          FT->getParamType(0)->isPointerTy() &&

crates/libafl_cc/src/cmplog-instructions-pass.cc

@@ -158,7 +158,7 @@ bool CmpLogInstructions::hookInstrs(Module &M) {
   }
 #endif
 
-  Constant *Null = Constant::getNullValue(PointerType::get(Int8Ty, 0));
+  Constant *Null = Constant::getNullValue(PointerType::get(M.getContext(), 0));
 
   /* iterate over all functions, bbs and instruction and add suitable calls */
   for (auto &F : M) {

crates/libafl_cc/src/cmplog-routines-pass.cc

@@ -75,7 +75,7 @@ bool CmpLogRoutines::hookRtns(Module &M) {
   IntegerType *Int8Ty = IntegerType::getInt8Ty(C);
   IntegerType *Int64Ty = IntegerType::getInt64Ty(C);
   IntegerType *Int32Ty = IntegerType::getInt32Ty(C);
-  PointerType *i8PtrTy = PointerType::get(Int8Ty, 0);
+  PointerType *i8PtrTy = PointerType::get(M.getContext(), 0);
 
   FunctionCallee cmplogHookFn;
   FunctionCallee cmplogLlvmStdStd;
@@ -229,8 +229,7 @@ bool CmpLogRoutines::hookRtns(Module &M) {
           isStrcmp &=
               FT->getNumParams() == 2 && FT->getReturnType()->isIntegerTy(32) &&
               FT->getParamType(0) == FT->getParamType(1) &&
-              FT->getParamType(0) ==
-                  IntegerType::getInt8Ty(M.getContext())->getPointerTo(0);
+              FT->getParamType(0) == PointerType::get(M.getContext(), 0);
 
           bool isStrncmp = (!FuncName.compare("strncmp") ||
                             !FuncName.compare("xmlStrncmp") ||
@@ -246,8 +245,7 @@ bool CmpLogRoutines::hookRtns(Module &M) {
           isStrncmp &=
               FT->getNumParams() == 3 && FT->getReturnType()->isIntegerTy(32) &&
               FT->getParamType(0) == FT->getParamType(1) &&
-              FT->getParamType(0) ==
-                  IntegerType::getInt8Ty(M.getContext())->getPointerTo(0) &&
+              FT->getParamType(0) == PointerType::get(M.getContext(), 0) &&
               FT->getParamType(2)->isIntegerTy();
 
           bool isGccStdStringStdString =

crates/libafl_cc/src/coverage-accounting-pass.cc

@@ -232,8 +232,8 @@ PreservedAnalyses AFLCoverage::run(Module &M, ModuleAnalysisManager &MAM) {
      __afl_acc_prev_loc is thread-local. */
 
   GlobalVariable *AFLMemOpPtr = new GlobalVariable(
-      M, PointerType::get(Int32Ty, 0), false, GlobalValue::ExternalLinkage, 0,
-      "__afl_acc_memop_ptr");
+      M, PointerType::get(M.getContext(), 0), false,
+      GlobalValue::ExternalLinkage, 0, "__afl_acc_memop_ptr");
 
   GlobalVariable *AFLPrevLoc;
 
@@ -301,7 +301,7 @@ PreservedAnalyses AFLCoverage::run(Module &M, ModuleAnalysisManager &MAM) {
       /* Load SHM pointer */
 
       LoadInst *MemReadPtr =
-          IRB.CreateLoad(PointerType::get(Int32Ty, 0), AFLMemOpPtr);
+          IRB.CreateLoad(PointerType::get(M.getContext(), 0), AFLMemOpPtr);
       MemReadPtr->setMetadata(M.getMDKindID("nosanitize"),
                               MDNode::get(C, None));
       Value *MemReadPtrIdx =