[clang] [clang] deprecate frelaxed-template-template-args, make it on by default (PR #89807)

[via cfe-commits]

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@@ -507,10 +507,62 @@ static TemplateDeductionResult DeduceNonTypeTemplateArgument(
       S, TemplateParams, NTTP, DeducedTemplateArgument(New), T, Info, Deduced);
 }
 
+static NamedDecl *DeduceTemplateArguments(Sema &S, NamedDecl *A,
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cor3ntin wrote:

This definitely needs a comment. The name should probably be along the lines of "SynthesizeTemplateArgumentWithDefaultArg" 

https://github.com/llvm/llvm-project/pull/89807