Use the CGCXXABI member on CodeGenTypes.

CodeGenTypes already has a reference to a CGCXXABI. Use this directly
rather than going through CodeGenModule to get to the same information.

This is consistent with other references to CGCXXABI in CodeGenTypes
functions defined in CGCall.cpp.

llvm-svn: 191854
diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index 84dd7bf..fa25222 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -182,8 +182,7 @@
 
   if (MD->isInstance()) {
     // The abstract case is perfectly fine.
-    const CXXRecordDecl *ThisType =
-        CGM.getCXXABI().getThisArgumentTypeForMethod(MD);
+    const CXXRecordDecl *ThisType = TheCXXABI.getThisArgumentTypeForMethod(MD);
     return arrangeCXXMethodType(ThisType, prototype.getTypePtr());
   }