[clang] [clang] CTAD alias: fix transformation for require-clause expr Part2. (PR #93533)

[Matheus Izvekov via cfe-commits]

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@@ -3100,6 +3118,7 @@ BuildDeductionGuideForTypeAlias(Sema &SemaRef,
         Context.getInjectedTemplateArg(NewParam));
     TransformedDeducedAliasArgs[AliasTemplateParamIdx] = NewTemplateArgument;
   }
+  unsigned UndeducedTemplateParameterStartIndex = FPrimeTemplateParams.size();
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mizvekov wrote:

Nit, this is a bit of a mouth full:
```suggestion
  unsigned FirstUndeducedParamIdx = FPrimeTemplateParams.size();
```

https://github.com/llvm/llvm-project/pull/93533