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

[GuanHong Liu]

use UINT64_C and drop __le64__
adddf3.c and addsf3.c are refactored in D3885

http://reviews.llvm.org/D2798

Files:
  lib/builtins/addtf3.c
  lib/builtins/subtf3.c
  test/builtins/Unit/addtf3_test.c
  test/builtins/Unit/subtf3_test.c
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