[PATCH] [PATCH v3] [PowerPC] Add Hardware Transaction Memory builtins support

[Adhemerval Zanella]

This patch adds Hardware Transaction Memory (HTM) support supported by
ISA 2.07 (POWER8).  The intrinsic support is based on GCC one [1], with
both 'PowerPC HTM Low Level Built-in Functions' and 'PowerPC HTM High
Level Inline Functions' implemented.

Along with builtins a new driver switch is added to enable/disable HTM
instruction support (-mhtm) and a header with common definitions (mostly
to parse the TFHAR register value).  The HTM switch also sets a
preprocessor builtin __HTM__.

The HTM usage requires a recently newer kernel with PPC HTM enabled.
Tested on powerpc64 and powerpc64le.

This is send along a llvm patch to enabled the builtins and option
switch.

[1] https://gcc.gnu.org/onlinedocs/gcc/PowerPC-Hardware-Transactional-Memory-Built-in-Functions.html

--

>From previous interactions, there is no need to check for negative values for
some builtins because ConstantInt::getZExtValue() returns an unsigned value.

--

Changes from previous version (v2):

- Fixed the error message for tsr builtin

Changes from previous version (v1):

- Fixed grammatical error raised by Will Schmidt
- Change __builtin_tcheck signature to no accept any arguments.  The CR fiels
  will be selected by the backend and the result will be adjusted accordingly.
- The return value for __builtin_tend, __builtin_tabort* has changed to return
  the full 4-bit CR value as its return value (similar to the __built_ttest).
  The __builtin_tbegin continue to return 0 or 1 as previous patch.

http://reviews.llvm.org/D8226

Files:
  include/clang/Basic/BuiltinsPPC.def
  include/clang/Driver/Options.td
  lib/Basic/Targets.cpp
  lib/CodeGen/CGBuiltin.cpp
  lib/Headers/htmintrin.h
  lib/Headers/htmxlintrin.h
  test/CodeGen/builtins-ppc-htm.c

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