Add hooks to softfloat to support per-lwp exception state.
add casts
fix -Wsign-compare issue (seen on arm), using similar techniqueto ../bits64/softfloat-macros
Import the 32-bit version of SoftFloat 2a and separate it and the 64-bitversion into different directories. Which version a given port uses iscontrolled by the SOFTFLOAT_BITS make variable. This
Import the 32-bit version of SoftFloat 2a and separate it and the 64-bitversion into different directories. Which version a given port uses iscontrolled by the SOFTFLOAT_BITS make variable. This is set to 64 (whichuses the same code we had before) by default. 32-bit platforms that don'tneed extended precision support might get better performance by using 32.Set the ARM port to use the 32-bit version of SoftFloat, since this is morethan a factor of two faster than the 64-bit version. This should get thefloating-point performance back to what it was in 1.5.
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