Support for modified jit-enabled VerySleepy.

This allows profiling the jit.  Should have zero perf impact when not
in use, since it's entirely triggered by VerySleepy.
Also report the vertex decoder jit to verysleepy.

Can use the same methods to support other platforms.
Jit profiling: include func name from map.
Correct jit block size for profiling.
Merge pull request #4692 from unknownbrackets/verysleepy

Add support for profiling jit via VerySleepy