[PATCH] [mips] Make TTypeEncoding indirect to allow .eh_frame to be read-only.

[Daniel Sanders]

Handle N32/N64 differences properly by allowing MipsTargetObjectFile to
change the TType encoding. This allows us to have a reasonable default
when there's no TargetMachine available and do the right thing when it
is available. The exception tables are self-describing so there's no
risk of issues with mixing different encodings in the same binary.

In the long term, MCObjectFileInfo should probably have visibility of the
TargetMachine.  Unfortunately there are a few issues with this:

- Not all callers that construct MCObjectFileInfo subclasses have a TargetMachine.
- Of those that have a TargetMachine, not all fully initialize it. In particular TargetOptions/MCTargetOptions are sometimes uninitialized.
- Of those that don't have a TargetMachine, not all have an ABI name stored elsewhere.


http://reviews.llvm.org/D9669

Files:
  include/llvm/MC/MCObjectFileInfo.h
  lib/MC/MCObjectFileInfo.cpp
  lib/Target/Mips/MipsTargetObjectFile.cpp
  lib/Target/Mips/MipsTargetObjectFile.h
  test/CodeGen/Mips/ehframe-indirect.ll

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