[AMDGPU][NFC] Refactor TryGetMCExprValue into evaluateMCExprs helper (#193859)
Replace the duplicated `TryGetMCExprValue` lambda in
`evaluateExtraSGPRs`, `evaluateTotalNumVGPR`, `evaluateAlignTo`, and
`evaluateOccupancy` with a shared static helper `evaluateMCExprs` that
takes an `initializer_list` of `uint64_t` references, enabling callers
to write:
```cpp
uint64_t VCCUsed, FlatScrUsed, XNACKUsed;
if (!evaluateMCExprs(Args, Asm, {VCCUsed, FlatScrUsed, XNACKUsed}))
return false;
```
Split out from #192306 per reviewer feedback.
This PR was created with the help of Github Copilot Claude Opus.
---------
Co-authored-by: Copilot <copilot@github.com>
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