[PATCH] [COMPILER-RT] Implement __multf3

[GuanHong Liu]

  Use CRT_HAS_128BIT and modify the codes according to gribozavr's comments

http://llvm-reviews.chandlerc.com/D2799

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2799?vs=7227&id=7330#toc

Files:
  lib/builtins/fp_mul_impl.inc
  lib/builtins/muldf3.c
  lib/builtins/mulsf3.c
  lib/builtins/multf3.c
  test/builtins/Unit/multf3_test.c
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