[libafl_cc] Fix PassPlugin LLVM header location

`PassPlugin.h` was moved from `Passes/` to `Plugins/` in LLVM commit:

`f54df0d09e19 ([LLVM][NFC] Move PassPlugin from Passes to separate library, 2025-12-22)`

(First tagged in LLVM 22 releases)

Author: rchildre3

crates/libafl_cc/src/common-llvm.h

@@ -25,7 +25,11 @@ constexpr std::nullopt_t None = std::nullopt;
 #include "llvm/Analysis/ValueTracking.h"
 #include "llvm/IR/Verifier.h"
 #include "llvm/IR/CFG.h"
-#include "llvm/Passes/PassPlugin.h"
+#if LLVM_VERSION_MAJOR >= 22
+  #include "llvm/Plugins/PassPlugin.h"
+#else
+  #include "llvm/Passes/PassPlugin.h"
+#endif
 #include "llvm/Passes/PassBuilder.h"
 #include "llvm/IR/PassManager.h"
 

crates/libafl_cc/src/function-logging.cc

@@ -38,7 +38,11 @@
 #include "llvm/ADT/Statistic.h"
 #include "llvm/IR/IRBuilder.h"
 
-#include "llvm/Passes/PassPlugin.h"
+#if LLVM_VERSION_MAJOR >= 22
+  #include "llvm/Plugins/PassPlugin.h"
+#else
+  #include "llvm/Passes/PassPlugin.h"
+#endif
 #include "llvm/Passes/PassBuilder.h"
 #include "llvm/IR/PassManager.h"