[nfc][sancov] Remove unnecessary default argument (llvm#117463)

Author: vitalybuka

llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp

@@ -254,7 +254,7 @@ class ModuleSanitizerCoverage {
                                 Instruction *I);
   Value *CreateFunctionLocalGateCmp(IRBuilder<> &IRB);
   void InjectCoverageAtBlock(Function &F, BasicBlock &BB, size_t Idx,
-                             Value *&FunctionGateCmp, bool IsLeafFunc = true);
+                             Value *&FunctionGateCmp, bool IsLeafFunc);
   Function *CreateInitCallsForSections(Module &M, const char *CtorName,
                                        const char *InitFunctionName, Type *Ty,
                                        const char *Section);