[cfe-dev] [PATCH 1/2] Add x32 psABI support

[Michael Liao]

- add '-mx32' option
- add linker/gcc-runtime support for x32 psABI

under x86-64 target, based on whether x32 psABI is turned on or off
- populate '_ILP32'/'__ILP32__' or '_LP64/__LP64__'
- set correct widths for data types
- add special handling of sret where pointer types could be packed
  with other 32-bit integer types into a single register
- detect target directly from target arch from target triple instead of
  pointer width

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