[PATCH] D18113: CodeGen: Use 32-bit gep offsets to address vtable address points.

[Peter Collingbourne via cfe-commits]

pcc created this revision.
pcc added reviewers: rsmith, rjmccall.
pcc added a subscriber: cfe-commits.

The relative vtable ABI will use a struct rather than an array as the type
of a vtable. LLVM only allows 32-bit integers as struct indices, so we need
to use 32-bit integers to get addresses of address points. In order to keep
the code simple, we might as well do that unconditionally.

It's probably a reasonable implementation limit to support no more than 2
billion virtual functions per class.

This change causes quite a bit of churn in the test suite, so I'm making
it separately.

http://reviews.llvm.org/D18113

Files:
  lib/CodeGen/CGVTT.cpp
  lib/CodeGen/ItaniumCXXABI.cpp
  test/CodeGenCXX/const-init-cxx11.cpp
  test/CodeGenCXX/constructor-init.cpp
  test/CodeGenCXX/copy-constructor-synthesis-2.cpp
  test/CodeGenCXX/copy-constructor-synthesis.cpp
  test/CodeGenCXX/microsoft-interface.cpp
  test/CodeGenCXX/skip-vtable-pointer-initialization.cpp
  test/CodeGenCXX/strict-vtable-pointers.cpp
  test/CodeGenCXX/vtable-assume-load.cpp
  test/CodeGenCXX/vtable-pointer-initialization.cpp
  test/CodeGenCXX/vtt-layout.cpp

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