[PATCH] [compiler-rt][builtins][MIPS] Add mips16 wrappers for float arithmetic, comparison and conversion

[Faraz Shahbazker]

Hi howard.hinnant,

This patch adds mips16 wrappers for floating-point arithmetic, comparison and type-conversion operations.

Background: mips16 code is not aware of floating point registers and call-conventions. For platforms equipped with hardware floating point, mips16 code resorts to calling an appropriate libgcc function with the float arguments in general purpose registers. The low-level function copies the arguments to FP registers, performs the operation and returns the result to the caller in a GP register.

Operations provided in this patch are:
Arithmetic(single & double precision): add, sub, mul, div 
Comparison(single & double precision): eq, ne, gt, ge, lt, le, unord
Type conversions:
- To signed integer: fix_truncXfsi
- To float: floatunsiXf, floatsiXf
- Within float formats: truncdfsf, extendsfdf

Patch for unit tests is: http://reviews.llvm.org/D4453

http://reviews.llvm.org/D4454

Files:
  lib/builtins/CMakeLists.txt
  lib/builtins/mips/mips16_cmpdf2.c
  lib/builtins/mips/mips16_cmpsf2.c
  lib/builtins/mips/mips16_extendsfdf2.c
  lib/builtins/mips/mips16_fix_truncdfsi.c
  lib/builtins/mips/mips16_fix_truncsfsi.c
  lib/builtins/mips/mips16_floatdf.c
  lib/builtins/mips/mips16_floatsf.c
  lib/builtins/mips/mips16_gen.h
  lib/builtins/mips/mips16_opdf3.c
  lib/builtins/mips/mips16_opsf3.c
  lib/builtins/mips/mips16_truncdfsf2.c
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