[PATCH] [COMPILER-RT] Implement __trunctfdf2, __trunctfsf2

[GuanHong Liu]

Implement __trunctfdf2, __trunctfsf2, which truncate long double type into float or double

http://llvm-reviews.chandlerc.com/D2803

Files:
  lib/fp_trunc.h
  lib/truncdfsf2.c
  lib/trunctfdf2.c
  lib/trunctfsf2.c
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