optimize Math.x to Math_x
when function is actually void, do not capture it's output even if llvm mistakenly bitcasts that way
assert on vars being in front of functions straight out of the js compiler
move heap align checks to asm2g, keep -O1 pristine
overflow numbers directly in js compiler
fix misc library asm validations
explicitly define setjmp helper vars
do not remove '.' from floats in parseNumerical
remove obsolete fp80 test
do not tack on .0 to Infinity or NaN
run js optimizer only in -O2+