[llvm] [DFAJumpThreading] Prevent pass from using too much memory. (PR #145482)

[Bushev Dmitry via llvm-commits]

dybv-sc wrote:

Example of this pass using too much memory:

Compilation of function `Perl_sv_vcatpvfn_flags` of module `sv.c` from `600.perlbench_s` benchmark with `-mllvm --enable-dfa-jump-thread` uses up to 16GB of heap. Almost all of this memory is allocated for threading paths. With the fix applied memory consumption shrinks down to less than ~500 MB.

https://github.com/llvm/llvm-project/pull/145482