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

[Shengchen Kan via llvm-commits]

KanRobert wrote:

> It's non-deterministic because the keys are pointer values, so ordering for them is not stable between runs.

I see. Could we change the type of `PredicateInstMap` to 
```
std::map<StringRef, std::vector<const CodeGenInstruction *>>
      PredicateInstMap;
```
where the `StringRef` is the `CondString` of the predicate. So that we don't have to resort it after the map is constructed.


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