[clang] fix(95366): enhance cast operation safety with LValue validation (PR #95479)

[Aaron Ballman via cfe-commits]

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@@ -847,6 +847,7 @@ Bug Fixes to C++ Support
 - Fixed several bugs in capturing variables within unevaluated contexts. (#GH63845), (#GH67260), (#GH69307),
   (#GH88081), (#GH89496), (#GH90669) and (#GH91633).
 - Fixed handling of brace ellison when building deduction guides. (#GH64625), (#GH83368).
+- Fix an assertion failure caused by non-lvalue usage in lvalue context. (GH95366).
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AaronBallman wrote:

I think a better way to phrase this might be along the lines of: Fixed a failed assertion when attempting to convert an integer representing the difference between two label addresses (a GNU extension) to a pointer within a constant expression.

https://github.com/llvm/llvm-project/pull/95479