[PATCH] MS ABI: Don't ICE for pointers to pointers to members of incomplete classes

[David Majnemer]

Hi rnk, rsmith,

CodeGen would try to come up with an LLVM IR type for a pointer to
member type on the way to forming an LLVM IR type for a pointer to
pointer to member type.

However, if the pointer to member representation has not been locked in yet,
we would not be able to come up with a pointer to member IR type.

In these cases, make the pointer to member type an incomplete type.
This will make the pointer to pointer to member type a pointer to an
incomplete type.  If the class eventually obtains an inheritance model,
we will make the pointer to member type represent the actual inheritance
model.

http://reviews.llvm.org/D5373

Files:
  lib/CodeGen/CGCXXABI.h
  lib/CodeGen/CodeGenFunction.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/CodeGen/CodeGenTypes.cpp
  lib/CodeGen/MicrosoftCXXABI.cpp
  test/CodeGenCXX/microsoft-abi-member-pointers.cpp
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