[PATCH] [Compiler-RT] Implements __gnu_f2h_ieee and __gnu_h2f_ieee

[Wan, Xiaofei]

On platforms which have no fp16 registers and instructions; It use lib-calls(__gnu_f2h_ieee and __gnu_h2f_ieee) to lower convert_from_fp16(llvm.convert.from.fp16) and convert_to_fp16(llvm.convert.to.fp16), but there are no implementations for these two lib-calls. This patch implements __gnu_f2h_ieee and __gnu_h2f_ieee for the compiler_rt library.

http://reviews.llvm.org/D4927

Files:
  lib/builtins/CMakeLists.txt
  lib/builtins/fp16.c
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