[PATCH] D12169: Relax constexpr rules to improve __builtin_object_size's accuracy

[George Burgess IV via cfe-commits]

george.burgess.iv updated this revision to Diff 33875.
george.burgess.iv marked 16 inline comments as done.
george.burgess.iv added a comment.

Addressed all feedback; backed out support for more questionable features (negative indices, non-object-boundary offsets, etc), added logic to ignore pointless casts, and added tests.

We're down to one new EvalMode (which is only used on `Type=1|3`).


http://reviews.llvm.org/D12169

Files:
  lib/AST/ExprConstant.cpp
  test/CodeGen/object-size.c

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