[llvm] Fix issue with running the same PassManager twice (PR #92823)

[Arthur Eubanks via llvm-commits]

================
@@ -264,4 +264,28 @@ TEST_F(PassManagerTest, DiagnosticHandler) {
               std::string::npos);
 }
 
+TEST_F(PassManagerTest, RunTwice) {
----------------
aeubanks wrote:

put this in `llvm/unittests/IR/PassManagerTest.cpp` instead

https://github.com/llvm/llvm-project/pull/92823