移除 ModMulIdiom pass

该惯用法识别优化（递归倍加模乘 → 单宽乘取模）缺乏可描述的合理优化
动机，删除其源文件并取消在 PassManager 中的注册。

Author: Arctitico

CMakeLists.txt

@@ -301,8 +301,6 @@ set(IR_SRCS
 	ir/passes/modulePass/SmallFunctionInline.cpp
 	ir/passes/functionPass/TailRecursionElim.h
 	ir/passes/functionPass/TailRecursionElim.cpp
-	ir/passes/functionPass/ModMulIdiom.h
-	ir/passes/functionPass/ModMulIdiom.cpp
 	ir/passes/functionPass/LateLoopCFGCleanup.h
 	ir/passes/functionPass/LateLoopCFGCleanup.cpp
 	ir/passes/functionPass/PhiLowering.h

ir/passes/PassManager.cpp

@@ -36,7 +36,6 @@
 #include "functionPass/LateLoopCFGCleanup.h"
 #include "functionPass/LoopRotate.h"
 #include "functionPass/Mem2Reg.h"
-#include "functionPass/ModMulIdiom.h"
 #include "functionPass/PhiToSelect.h"
 #include "functionPass/PhiLowering.h"
 #include "functionPass/PureCallCSE.h"
@@ -114,13 +113,6 @@ void PassManager::registerDefaultOptimizationPipeline(int32_t optLevel, bool ena
         return false;
     });
 
-    // 递归倍加模乘惯用法识别：须在 Mem2Reg 后（依赖 SSA 分支形态）、
-    // GVN/InstCombine 前（避免 srem/sdiv 被变形破坏匹配）
-    registerFunctionPass("ModMulIdiom", [this](Function * func) {
-        ModMulIdiom pass(func, module);
-        return pass.run();
-    });
-
     registerFunctionPass("GVN", [this](Function * func) {
         GVN pass(func, module);
         return pass.run();