[PATCH] [COMPILER-RT] Implement __extendsftf2, __extenddftf2

[GuanHong Liu]

use UINT64_C and drop __le64__
extendsfdf2.c is refactored in D3887

http://reviews.llvm.org/D2802

Files:
  lib/builtins/extenddftf2.c
  lib/builtins/extendsftf2.c
  test/builtins/Unit/extenddftf2_test.c
  test/builtins/Unit/extendsftf2_test.c
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