[PATCH] [COMPILER-RT] Implement __addtf3 and __subtf3

[GuanHong Liu]

  add test

http://llvm-reviews.chandlerc.com/D2798

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2798?vs=7107&id=7226#toc

Files:
  lib/builtins/adddf3.c
  lib/builtins/addsf3.c
  lib/builtins/addtf3.c
  lib/builtins/fp_add.h
  lib/builtins/subtf3.c
  test/builtins/Unit/addtf3_test.c
  test/builtins/Unit/subtf3_test.c
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