[clang] [llvm] [LLVM] Add IRNormalizer Pass (PR #68176)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-expensive-checks-debian` running on `gribozavr4` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/16/builds/7518

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: Transforms/IRNormalizer/regression-infinite-loop.ll' FAILED ********************
Exit Code: 2

Command Output (stderr):
--
RUN: at line 2: /b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt -S -passes=normalize < /b/1/llvm-clang-x86_64-expensive-checks-debian/llvm-project/llvm/test/Transforms/IRNormalizer/regression-infinite-loop.ll | /b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/FileCheck /b/1/llvm-clang-x86_64-expensive-checks-debian/llvm-project/llvm/test/Transforms/IRNormalizer/regression-infinite-loop.ll
+ /b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt -S -passes=normalize
+ /b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/FileCheck /b/1/llvm-clang-x86_64-expensive-checks-debian/llvm-project/llvm/test/Transforms/IRNormalizer/regression-infinite-loop.ll
LLVM ERROR: Function @test changed by IRNormalizerPass without invalidating analyses
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt -S -passes=normalize
1.	Running pass "function(normalize)" on module "<stdin>"
2.	Running pass "normalize" on function "test"
 #0 0x00000000045c7697 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x45c7697)
 #1 0x00000000045c514e llvm::sys::RunSignalHandlers() (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x45c514e)
 #2 0x00000000045c7d4f SignalHandler(int) Signals.cpp:0:0
 #3 0x00007f95c2d96140 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x13140)
 #4 0x00007f95c28aad51 raise (/lib/x86_64-linux-gnu/libc.so.6+0x38d51)
 #5 0x00007f95c2894537 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22537)
 #6 0x00000000045290aa llvm::report_fatal_error(llvm::Twine const&, bool) (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x45290aa)
 #7 0x00000000028458da void llvm::detail::UniqueFunctionBase<void, llvm::StringRef, llvm::Any, llvm::PreservedAnalyses const&>::CallImpl<llvm::PreservedCFGCheckerInstrumentation::registerCallbacks(llvm::PassInstrumentationCallbacks&, llvm::AnalysisManager<llvm::Module>&)::$_18>(void*, llvm::StringRef, llvm::Any&, llvm::PreservedAnalyses const&) StandardInstrumentations.cpp:0:0
 #8 0x00000000043f760e llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x43f760e)
 #9 0x0000000000d0b26d llvm::detail::PassModel<llvm::Function, llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) crtstuff.c:0:0
#10 0x00000000043fb840 llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x43fb840)
#11 0x0000000000d0b03d llvm::detail::PassModel<llvm::Module, llvm::ModuleToFunctionPassAdaptor, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) crtstuff.c:0:0
#12 0x00000000043f6407 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x43f6407)
#13 0x000000000085cf50 llvm::runPassPipeline(llvm::StringRef, llvm::Module&, llvm::TargetMachine*, llvm::TargetLibraryInfoImpl*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::StringRef, llvm::ArrayRef<llvm::PassPlugin>, llvm::ArrayRef<std::function<void (llvm::PassBuilder&)>>, llvm::opt_tool::OutputKind, llvm::opt_tool::VerifierKind, bool, bool, bool, bool, bool, bool, bool) (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x85cf50)
#14 0x0000000000852635 optMain (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x852635)
#15 0x00007f95c2895d7a __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x23d7a)
#16 0x000000000084e99a _start (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x84e99a)
FileCheck error: '<stdin>' is empty.
FileCheck command line:  /b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/FileCheck /b/1/llvm-clang-x86_64-expensive-checks-debian/llvm-project/llvm/test/Transforms/IRNormalizer/regression-infinite-loop.ll

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/68176