Light refactoring of handleExecuteInline.

I wanted the code to JIT a call a C function extracted so I can potentially
use it elsewhere. The functions that sometimes JIT instructions directly and
other times bail out to C can now call this, simplifying the body of the
switch. I think there's a behavioral change here with the ThumbVFP
genInlineSqrt, which previously had the wrong return value.

Tested on passion to ensure that the performance characteristics of assembler
intrinsics, C intrinsics, and library native methods haven't changed (using
the Math and Float classes).

Change-Id: Id79771a31abe3a516f403486454e9c0d9793622a
6 files changed