[clang] [clang-tools-extra] [Clang] Unify interface for accessing template arguments as written for class/variable template specializations (PR #81642)

[Krystian Stasiowski via cfe-commits]

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@@ -6390,6 +6394,7 @@ TEST(HasTemplateArgumentLoc, BindsToSpecializationWithDoubleArgument) {
                               0, hasTypeLoc(loc(asString("double")))))))))));
 }
 
+#if 0
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sdkrystian wrote:

@erichkeane I just pushed a commit which converts all the `#if`'d out test to use `hasTemplateArgument`/`hasAnyTemplateArgument` instead of `hasTemplateArgumentLoc`/`hasAnyTemplateArgumentLoc`. However, this is a temporary measure.

I want to add support for `ClassTemplateSpecializationDecl`, `VarTemplateSpecializationDecl`, and `FunctionDecl` to `hasTemplateArgumentLoc`/`hasAnyTemplateArgumentLoc` so these tests can be switched back to using the `TemplateArgumentLoc` matchers, but I'm not sure whether it should be included in this PR, or have it's own follow-up PR (I would prefer to include it in this one).

https://github.com/llvm/llvm-project/pull/81642