Move checkInterfaceFunction to ModuleUtils

Summary:
Instead of making a local copy of `checkInterfaceFunction` for each
sanitizer, move the function in a common place.

Reviewers: kcc, samsonov

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8775

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234220 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Utils/ModuleUtils.cpp

@@ -17,6 +17,7 @@
 #include "llvm/IR/Function.h"
 #include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/Module.h"
+#include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
 
@@ -93,3 +94,13 @@ llvm::collectUsedGlobalVariables(Module &M, SmallPtrSetImpl<GlobalValue *> &Set,
   }
   return GV;
 }
+
+Function *llvm::checkSanitizerInterfaceFunction(Constant *FuncOrBitcast) {
+  if (isa<Function>(FuncOrBitcast))
+    return cast<Function>(FuncOrBitcast);
+  FuncOrBitcast->dump();
+  std::string Err;
+  raw_string_ostream Stream(Err);
+  Stream << "Sanitizer interface function redefined: " << *FuncOrBitcast;
+  report_fatal_error(Err);
+}