[PATCH] [Parse] Allow 'constexpr' in condition declarations

[Meador Inge]

Here is a new version with the previous feedback incorporated:

1. Use 'DSC_condition' instead of 'DSC_constexpr'.

2. Delay applying `ActOnFinishFullExpr' until all switch conditions are done.  I ended up unconditionally adding `ActOnFinishFullExpr' for the if, for, while, and switch cases.  There is a small amount of duplication, but it makes the code easier to follow since you don't have to think about under what conditions the call happens (and I personally found it difficult to understand why it was conditional with 'switch' to begin with).  Also, it seems to be common practice to directly call `ActOnFinishFullExpr' in a lot of the other Sema implementation pieces.


http://reviews.llvm.org/D8978

Files:
  lib/Target/AArch64/AArch64TargetMachine.cpp
  lib/Target/ARM/ARMTargetMachine.cpp
  lib/Target/Mips/MipsTargetMachine.cpp
  lib/Target/R600/AMDGPUTargetMachine.cpp
  lib/Target/SystemZ/SystemZTargetMachine.cpp

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