[PATCH] [COMPILER_RT] Implement __extendsftf2, __extenddftf2

[GuanHong Liu]

  modify by gribozavr's comment and use COMPILER_RT_ABI

http://llvm-reviews.chandlerc.com/D2802

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2802?vs=7419&id=7678#toc

Files:
  lib/builtins/extenddftf2.c
  lib/builtins/extendsfdf2.c
  lib/builtins/extendsftf2.c
  lib/builtins/fp_extend.h
  lib/builtins/fp_extend_impl.inc
  test/builtins/Unit/extenddftf2_test.c
  test/builtins/Unit/extendsftf2_test.c
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