Add arrangeCXXMethodCall to the CodeGenABITypes interface.

In MSVC, the calling conventions for free functions and C++ instance
methods could be different, it makes sense to have this variant there.

Author: hjyamauchi

clang/include/clang/CodeGen/CodeGenABITypes.h

@@ -75,6 +75,12 @@ const CGFunctionInfo &arrangeCXXMethodType(CodeGenModule &CGM,
                                            const FunctionProtoType *FTP,
                                            const CXXMethodDecl *MD);
 
+const CGFunctionInfo &arrangeCXXMethodCall(CodeGenModule &CGM,
+                                           CanQualType returnType,
+                                           ArrayRef<CanQualType> argTypes,
+                                           FunctionType::ExtInfo info,
+                                           RequiredArgs args);
+
 const CGFunctionInfo &arrangeFreeFunctionCall(CodeGenModule &CGM,
                                               CanQualType returnType,
                                               ArrayRef<CanQualType> argTypes,

clang/lib/CodeGen/CodeGenABITypes.cpp

@@ -59,6 +59,14 @@ CodeGen::arrangeCXXMethodType(CodeGenModule &CGM,
   return CGM.getTypes().arrangeCXXMethodType(RD, FTP, MD);
 }
 
+const CGFunctionInfo &
+CodeGen::arrangeCXXMethodCall(CodeGenModule &CGM, CanQualType returnType,
+                              ArrayRef<CanQualType> argTypes,
+                              FunctionType::ExtInfo info, RequiredArgs args) {
+  return CGM.getTypes().arrangeLLVMFunctionInfo(
+      returnType, FnInfoOpts::IsInstanceMethod, argTypes, info, {}, args);
+}
+
 const CGFunctionInfo &
 CodeGen::arrangeFreeFunctionCall(CodeGenModule &CGM,
                                  CanQualType returnType,