[MemoryBuiltins] Remove unused isStrdupLikeFn() function (NFC)

This function is no longer used after
dcbc91f.

Author: nikic

llvm/include/llvm/Analysis/MemoryBuiltins.h

@@ -92,10 +92,6 @@ bool isReallocLikeFn(const Function *F, const TargetLibraryInfo *TLI);
 /// allocates memory and throws if an allocation failed (e.g., new).
 bool isOpNewLikeFn(const Value *V, const TargetLibraryInfo *TLI);
 
-/// Tests if a value is a call or invoke to a library function that
-/// allocates memory (strdup, strndup).
-bool isStrdupLikeFn(const Value *V, const TargetLibraryInfo *TLI);
-
 //===----------------------------------------------------------------------===//
 //  free Call Utility Functions.
 //

llvm/lib/Analysis/MemoryBuiltins.cpp

@@ -292,12 +292,6 @@ bool llvm::isOpNewLikeFn(const Value *V, const TargetLibraryInfo *TLI) {
   return getAllocationData(V, OpNewLike, TLI).hasValue();
 }
 
-/// Tests if a value is a call or invoke to a library function that
-/// allocates memory (strdup, strndup).
-bool llvm::isStrdupLikeFn(const Value *V, const TargetLibraryInfo *TLI) {
-  return getAllocationData(V, StrDupLike, TLI).hasValue();
-}
-
 bool llvm::isAllocRemovable(const CallBase *CB, const TargetLibraryInfo *TLI) {
   assert(isAllocationFn(CB, TLI));