[clang] [clang] Fix high memory consumption during pack deduction (PR #88637)

[Thorsten Schütt via cfe-commits]

================
@@ -831,7 +831,7 @@ class PackDeductionScope {
     if (IsPartiallyExpanded)
       PackElements += NumPartialPackArgs;
     else if (IsExpanded)
-      PackElements += *FixedNumExpansions;
+      PackElements += FixedNumExpansions.value_or(1);
----------------
tschuett wrote:
Could you add an assert:
```
assert(FixedNumExpansions && "unexpected nullopt");
```

https://github.com/llvm/llvm-project/pull/88637
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