[NFC] IRGen: Lift this function from IGF to IGM.

Author: nate-chandler

lib/IRGen/GenPointerAuth.cpp

@@ -771,6 +771,10 @@ void ConstantAggregateBuilderBase::addSignedPointer(llvm::Constant *pointer,
  llvm::ConstantInt::get(IGM().Int64Ty, otherDiscriminator));
 }
 
+llvm::ConstantInt *IRGenModule::getMallocTypeId(llvm::Function *fn) {
+ return getDiscriminatorForString(*this, fn->getName());
+}
+
 llvm::ConstantInt* IRGenFunction::getMallocTypeId() {
- return getDiscriminatorForString(IGM, CurFn->getName());
+ return IGM.getMallocTypeId(CurFn);
 }

lib/IRGen/IRGenModule.h

@@ -1674,6 +1674,8 @@ private: \
  llvm::AttributeList constructInitialAttributes();
  StackProtectorMode shouldEmitStackProtector(SILFunction *f);
 
+ llvm::ConstantInt *getMallocTypeId(llvm::Function *fn);
+
  void emitProtocolDecl(ProtocolDecl *D);
  void emitEnumDecl(EnumDecl *D);
  void emitStructDecl(StructDecl *D);