[llvm] [utils/TableGen/X86CompressEVEXTablesEmitter.cpp] Make sure the tablegen output for the `checkPredicate` function is deterministic (PR #84533)

[Argyrios Kyrtzidis via llvm-commits]

akyrtzi wrote:

> Could we change the type of PredicateInstMap

I like this idea, see updated commit.

https://github.com/llvm/llvm-project/pull/84533