IREmitter can't fail gracefully on large code blocks
If a code block overruns the 16MB(8MB times two) of temporary IR space we allocate per thread then FEX throws an assert and doesn't fallback gracefully.

Investigate how we can fail gracefully.
Reject superblock and force upper limit on superblock size?
Expand the working IR size?

16MB is fairly large already and if we supported resizing the temp space then this could be quite a bit nicer on memory consumption.
8MB goes to OrderedNode tracking, which gives 524288 possible IR ops.
The other 8MB goes to the OpData tracking, which obviously can't get anywhere near that 524k number.

Simple asm test to trigger this case. Make sure to set blocksize to -1 to allow infinite block size.
```asm
%ifdef CONFIG
{
}
%endif

mov eax, 0

%rep 65537
and eax, 0
%endrep

hlt
```