These flags are usable on floating point arithmetic, as well as call,
select, and phi instructions whose resulting type is floating point, or
a vector of, or an array of, a valid type. Whether or not the flags are
valid for a given instruction can be checked with the new
LLVMCanValueUseFastMathFlags function.
These are exposed using a new LLVMFastMathFlags type, which is an alias
for unsigned. An anonymous enum defines the bit values for it.
Tests are added in echo.ll for select/phil/call, and the floating point
types in the new float_ops.ll bindings test.
Select and the floating point arithmetic instructions were not
implemented in llvm-c-test/echo.cpp, so they were added as well.
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