[clang] [MC/DC][Coverage] Add assertions into emitSourceRegions() (PR #89572)

[Jessica Paquette via cfe-commits]

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@@ -190,6 +190,16 @@ class SourceMappingRegion {
 
   bool isBranch() const { return FalseCount.has_value(); }
 
+  bool isMCDCBranch() const {
+    const auto *BranchParams = std::get_if<mcdc::BranchParameters>(&MCDCParams);
+    assert(BranchParams == nullptr || BranchParams->ID >= 0);
+    return (BranchParams != nullptr);
+  }
+
+  const auto &getMCDCBranchParams() const {
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ornata wrote:

unused function?

https://github.com/llvm/llvm-project/pull/89572