[clang] Control analysis-based diagnostics with #pragma (PR #136323)

[via cfe-commits]

================
@@ -2504,24 +2505,28 @@ sema::AnalysisBasedWarnings::AnalysisBasedWarnings(Sema 
&s)
       NumUninitAnalysisVariables(0), MaxUninitAnalysisVariablesPerFunction(0),
       NumUninitAnalysisBlockVisits(0),
       MaxUninitAnalysisBlockVisitsPerFunction(0) {
+}
+
+// We need this here for unique_ptr with forward declared class.
+sema::AnalysisBasedWarnings::~AnalysisBasedWarnings() = default;
 
+sema::AnalysisBasedWarnings::Policy
+sema::AnalysisBasedWarnings::getPolicyInEffectAt(SourceLocation Loc) {
   using namespace diag;
   DiagnosticsEngine &D = S.getDiagnostics();
+  Policy P;
 
-  DefaultPolicy.enableCheckUnreachable =
-      isEnabled(D, warn_unreachable) || isEnabled(D, warn_unreachable_break) ||
-      isEnabled(D, warn_unreachable_return) ||
-      isEnabled(D, warn_unreachable_loop_increment);
+  P.enableCheckUnreachable = isEnabled(D, warn_unreachable, Loc) ||
----------------
Sirraide wrote:

Definitely

https://github.com/llvm/llvm-project/pull/136323
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