Extend the "skip-test" optimization to all instructions that modify the

[Lotendan]

Extend the "skip-test" optimization to all instructions that modify the same flags as "TEST" x86 instruction

Originally wanted to only cover the "POPCNT" case, but actually we can go further than that and cover more instructions.

Fixes #118811

Using the following code:

static void M1(int value)
{
    if (int.PopCount(value) > 0) 
        throw null!;
}

This fix reduces this assembly:

popcnt   edi, edi
test     edi, edi
jg       SHORT G_M9581_IG04

to this assembly:

popcnt    edi, edi
jg       SHORT G_M000_IG04

Note: this is not exactly as was intended in the issue, where a jne was expected. But that should be good enough.
Note2: this does not affect tnzcnt or lzcnt instructions as these instructions do not modify the flags.

[Lotendan]

@dotnet-policy-service agree

[Lotendan]

Unsure here whether it makes sense to add a condition on AF flag as well