[clang] [clang][CodeGen] Keep processing the rest of AST after encountering unsupported MC/DC expressions (PR #82464)

[Alan Phipps via cfe-commits]

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@@ -239,9 +239,12 @@ struct MapRegionCounters : public RecursiveASTVisitor<MapRegionCounters> {
     if (MCDCMaxCond == 0)
       return true;
 
-    /// At the top of the logical operator nest, reset the number of conditions.
-    if (LogOpStack.empty())
+    /// At the top of the logical operator nest, reset the number of conditions,
+    /// also forget previously seen split nesting cases.
+    if (LogOpStack.empty()) {
       NumCond = 0;
+      SplitNestedLogicalOp = false;
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evodius96 wrote:

Definitely a bug that we weren't resetting this. 

https://github.com/llvm/llvm-project/pull/82464