SanitizerCoverage: Remove unused field.

Author: pcc

llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp

@@ -284,7 +284,6 @@ class ModuleSanitizerCoverage {
   GlobalVariable *SanCovCallbackGate;
   Type *PtrTy, *IntptrTy, *Int64Ty, *Int32Ty, *Int16Ty, *Int8Ty, *Int1Ty;
   Module *CurModule;
-  std::string CurModuleUniqueId;
   Triple TargetTriple;
   LLVMContext *C;
   const DataLayout *DL;
@@ -399,7 +398,6 @@ bool ModuleSanitizerCoverage::instrumentModule() {
   C = &(M.getContext());
   DL = &M.getDataLayout();
   CurModule = &M;
-  CurModuleUniqueId = getUniqueModuleId(CurModule);
   TargetTriple = M.getTargetTriple();
   FunctionGuardArray = nullptr;
   Function8bitCounterArray = nullptr;