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

[GuanHong Liu]

Implement __addtf3 and __subtf3, which performs long double addition and substraction

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

Files:
  lib/adddf3.c
  lib/addsf3.c
  lib/addtf3.c
  lib/fp_add.h
  lib/subtf3.c
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