Use SSE pow/powi helper functions from compiled code. Cleanup use of helper functions. Related cleanups of folding functions in x64 interpreter.
Compile math.sinh(), math.cosh(), math.tanh() and math.random(). Compile various io.*() functions. Drive the GC forward on string allocations in the parser. Improve KNUM fuse vs. load heuristics. Add abstract C call handling to IR.