[llvm] [SandboxVec] Add a simple pack reuse pass (PR #141848)

[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/20221

<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/SandboxVectorizer/pack_reuse_basic.ll' FAILED ********************
Exit Code: 2

Command Output (stderr):
--
/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt -passes=sandbox-vectorizer -sbvec-vec-reg-bits=1024 -sbvec-passes="regions-from-metadata<pack-reuse>" /b/1/llvm-clang-x86_64-expensive-checks-debian/llvm-project/llvm/test/Transforms/SandboxVectorizer/pack_reuse_basic.ll -S | /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/SandboxVectorizer/pack_reuse_basic.ll # RUN: at line 2
+ /b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt -passes=sandbox-vectorizer -sbvec-vec-reg-bits=1024 '-sbvec-passes=regions-from-metadata<pack-reuse>' /b/1/llvm-clang-x86_64-expensive-checks-debian/llvm-project/llvm/test/Transforms/SandboxVectorizer/pack_reuse_basic.ll -S
+ /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/SandboxVectorizer/pack_reuse_basic.ll
LLVM ERROR: Function @pack_reuse changed by SandboxVectorizerPass 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 -passes=sandbox-vectorizer -sbvec-vec-reg-bits=1024 -sbvec-passes=regions-from-metadata<pack-reuse> /b/1/llvm-clang-x86_64-expensive-checks-debian/llvm-project/llvm/test/Transforms/SandboxVectorizer/pack_reuse_basic.ll -S
1.	Running pass "function(sandbox-vectorizer)" on module "/b/1/llvm-clang-x86_64-expensive-checks-debian/llvm-project/llvm/test/Transforms/SandboxVectorizer/pack_reuse_basic.ll"
2.	Running pass "sandbox-vectorizer" on function "pack_reuse"
 #0 0x0000000004b1daf7 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x4b1daf7)
 #1 0x0000000004b1b5ae llvm::sys::RunSignalHandlers() (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x4b1b5ae)
 #2 0x0000000004b1e1fa SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #3 0x00007f7062688140 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x13140)
 #4 0x00007f706219cd61 raise (/lib/x86_64-linux-gnu/libc.so.6+0x38d61)
 #5 0x00007f7062186537 abort (/lib/x86_64-linux-gnu/libc.so.6+0x22537)
 #6 0x0000000004a7ccfa llvm::report_fatal_error(llvm::Twine const&, bool) (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x4a7ccfa)
 #7 0x00000000026ecdda 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 0x00000000049469df 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+0x49469df)
 #9 0x0000000000d90d3d 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 0x000000000494add0 llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x494add0)
#11 0x0000000000d9183d llvm::detail::PassModel<llvm::Module, llvm::ModuleToFunctionPassAdaptor, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) crtstuff.c:0:0
#12 0x0000000004945787 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+0x4945787)
#13 0x00000000008a5f7d 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+0x8a5f7d)
#14 0x000000000089b977 optMain (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x89b977)
#15 0x00007f7062187d7a __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x23d7a)
#16 0x000000000089793a _start (/b/1/llvm-clang-x86_64-expensive-checks-debian/build/bin/opt+0x89793a)
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/SandboxVectorizer/pack_reuse_basic.ll

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/141848