[clang] [Clang][Sema] Tweak tryCaptureVariable for unevaluated lambdas (PR #93206)

[Younan Zhang via cfe-commits]

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@@ -1576,7 +1576,10 @@ ExprResult Parser::ParseLambdaExpressionAfterIntroducer(
                       TrailingReturnTypeLoc, &DS),
                   std::move(Attributes), DeclEndLoc);
 
-    Actions.ActOnLambdaClosureQualifiers(Intro, MutableLoc);
+    // We have called ActOnLambdaClosureQualifiers for parentheses-less cases
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zyn0217 wrote:

Yeah, looking into `ActOnLambdaClosureQualifiers`, I don't see anything that (currently) depends on lambda parameters. I guess we can combine these two calls? I'd love to open a separate NFC PR for doing so, before landing this patch. :)

@erichkeane I retrospected your comment in https://github.com/llvm/llvm-project/pull/78598#discussion_r1478458713 and I appreciate the diagnostics for non-ODR uses - however that's much like a QoI issue to me and would it be OK to leave it as a follow-up? Let me know what you think and I'll add a FIXME then.

https://github.com/llvm/llvm-project/pull/93206