[WebAssembly] Optimize `WebAssemblyCFGSort`'s post sort verifications. (#182458)HEADmain

Currently, the post-sort verifications `WebAssemblyCFGSort` does in
assertion builds is quite expensive. Given the example of
[usagi-coffee/tree-sitter-abl](https://github.com/usagi-coffee/tree-sitter-abl),
we have one MASSIVE function with nearly 120K blocks. Sorting this is
fast, but the verifications after take some 40+ seconds (on my machine).

The culprit was the manipulation of the region `OnStack`. I've tried to
replace that with interval based verifications to make sure the regions
are well formed, well nested, and that the numbers of the blocks within
a region are within the interval of the numbers of the header and bottom
of the region.

This brings the aforementioned example down to well under a second spent
in the pass in an assertions build.

0 files changed, 0 insertions, 0 deletions