Add a comment for r104472.
llvm-svn: 104473
diff --git a/clang/lib/CodeGen/CGStmt.cpp b/clang/lib/CodeGen/CGStmt.cpp
index 3e807bd..efde380 100644
--- a/clang/lib/CodeGen/CGStmt.cpp
+++ b/clang/lib/CodeGen/CGStmt.cpp
@@ -79,6 +79,9 @@
// Expression emitters don't handle unreachable blocks yet, so look for one
// explicitly here. This handles the common case of a call to a noreturn
// function.
+ // We can't erase blocks with an associated cleanup size here since the
+ // memory might be reused, leaving the old cleanup info pointing at a new
+ // block.
if (llvm::BasicBlock *CurBB = Builder.GetInsertBlock()) {
if (CurBB->empty() && CurBB->use_empty() && !BlockScopes.count(CurBB)) {
CurBB->eraseFromParent();