[clang] [clang][nullability] Don't discard expression state before end of full-expression. (PR #82611)

[Yitzhak Mandelbaum via cfe-commits]

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@@ -221,18 +221,21 @@ class PrettyStackTraceCFGElement : public llvm::PrettyStackTraceEntry {
 // Avoids unneccesary copies of the environment.
 class JoinedStateBuilder {
   AnalysisContext ∾
+  Environment::ExprJoinBehavior ExprBehavior;
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ymand wrote:

If you're going to shorten the variable name, then I think JoinBehavior might be better (since this doesn't have to do with the behavior of expressions).

https://github.com/llvm/llvm-project/pull/82611