[Test] Added test for CSE RAUW change.

[nate-chandler]

Added a reduced case of the issue that was addressed by #41450 . When the RAUW utility handles reborrows properly, the check lines of this case can be adjusted accordingly.

[nate-chandler]

@swift-ci please test

[nate-chandler]

Without that patch, this test results in

Assertion failed: (!isAliveAtBeginOfBlock(getFunction()->getEntryBlock()) && "Can't compute frontier for def which does not dominate all uses"), function computeLifetime, file /path/to/source/root/swift/lib/SILOptimizer/Utils/ValueLifetime.cpp, line 126.
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project and the crash backtrace.
Stack dump:
0.	Program arguments: /path/to/build/root/swift-macosx-x86_64/bin/sil-opt -enable-lexical-lifetimes -enable-copy-propagation -sil-inline-generics -enable-sil-verify-all --cse main.sil
1.	While evaluating request ExecuteSILPipelineRequest(Run pipelines { Pass List Pipeline } on SIL for main)
2.	While running pass #0 SILFunctionTransform "CSE" on SILFunction "@dont_rauw_guaranteed_with_nondominated_reborrow".
 main.sil|13| 13
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  sil-opt                  0x0000000107d2e1b7 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 39
1  sil-opt                  0x0000000107d2d295 llvm::sys::RunSignalHandlers() + 85
2  sil-opt                  0x0000000107d2e7e0 SignalHandler(int) + 272
3  libsystem_platform.dylib 0x00007ff80cd78e2d _sigtramp + 29
4  libsystem_platform.dylib 0x00007ff7bede4c58 _sigtramp + 18446744072401370696
5  libsystem_c.dylib        0x00007ff80ccafd10 abort + 123
6  libsystem_c.dylib        0x00007ff80ccaf0be err + 0
7  sil-opt                  0x0000000102b79507 swift::ValueLifetimeAnalysis::computeLifetime(llvm::function_ref<bool (swift::SILBasicBlock*)>, llvm::function_ref<void (swift::SILInstruction*)>, llvm::function_ref<void (swift::SILBasicBlock*, swift::SILBasicBlock*)>) + 167
8  sil-opt                  0x0000000102b79a64 swift::ValueLifetimeAnalysis::computeLifetimeBoundary(swift::ValueLifetimeBoundary&) + 148
9  sil-opt                  0x0000000102b97229 swift::BeginBorrowInst* (anonymous namespace)::OwnershipLifetimeExtender::borrowCopyOverGuaranteedUsers<swift::TransformRange<llvm::ArrayRef<swift::Operand*>, std::__1::function<swift::SILInstruction* (swift::Operand*)> > >(swift::SILValue, llvm::ilist_iterator<llvm::ilist_detail::node_options<swift::SILInstruction, true, false, void>, false, false>, swift::TransformRange<llvm::ArrayRef<swift::Operand*>, std::__1::function<swift::SILInstruction* (swift::Operand*)> >) + 649
10 sil-opt                  0x0000000102b7ee96 swift::BeginBorrowInst* (anonymous namespace)::OwnershipLifetimeExtender::borrowCopyOverGuaranteedUses<llvm::ArrayRef<swift::Operand*> >(swift::SILValue, llvm::ilist_iterator<llvm::ilist_detail::node_options<swift::SILInstruction, true, false, void>, false, false>, llvm::ArrayRef<swift::Operand*>) + 150
11 sil-opt                  0x0000000102b86810 (anonymous namespace)::OwnershipLifetimeExtender::borrowOverValue(swift::SILValue, swift::SILValue) + 480
12 sil-opt                  0x0000000102b7fda8 (anonymous namespace)::OwnershipRAUWPrepare::prepareReplacement(swift::SILValue) + 632
13 sil-opt                  0x0000000102b7fa9f swift::OwnershipRAUWHelper::prepareReplacement(swift::SILValue) + 703
14 sil-opt                  0x0000000102b7ff13 swift::OwnershipRAUWHelper::perform(swift::SILValue) + 67
15 sil-opt                  0x000000010272e833 swift::CSE::processNode(llvm::DomTreeNodeBase<swift::SILBasicBlock>*) + 2067
16 sil-opt                  0x000000010272dd1e swift::CSE::processFunction(swift::SILFunction&, swift::DominanceInfo*) + 382
17 sil-opt                  0x000000010275cec3 (anonymous namespace)::SILCSE::run() + 467
18 sil-opt                  0x00000001025676b6 swift::SILPassManager::runPassOnFunction(unsigned int, swift::SILFunction*) + 1830
19 sil-opt                  0x0000000102568c1a swift::SILPassManager::runFunctionPasses(unsigned int, unsigned int) + 1034
20 sil-opt                  0x000000010256ceab swift::SILPassManager::execute() + 571
21 sil-opt                  0x00000001025657db swift::SILPassManager::executePassPipelinePlan(swift::SILPassPipelinePlan const&) + 427
22 sil-opt                  0x00000001025655b5 swift::ExecuteSILPipelineRequest::evaluate(swift::Evaluator&, swift::SILPipelineExecutionDescriptor) const + 101
23 sil-opt                  0x00000001025bfa1a std::__1::tuple<> swift::SimpleRequest<swift::ExecuteSILPipelineRequest, std::__1::tuple<> (swift::SILPipelineExecutionDescriptor), (swift::RequestFlags)1>::callDerived<0ul>(swift::Evaluator&, std::__1::integer_sequence<unsigned long, 0ul>) const + 138
24 sil-opt                  0x00000001025bf940 swift::SimpleRequest<swift::ExecuteSILPipelineRequest, std::__1::tuple<> (swift::SILPipelineExecutionDescriptor), (swift::RequestFlags)1>::evaluateRequest(swift::ExecuteSILPipelineRequest const&, swift::Evaluator&) + 32
25 sil-opt                  0x000000010258900d llvm::Expected<swift::ExecuteSILPipelineRequest::OutputType> swift::Evaluator::getResultUncached<swift::ExecuteSILPipelineRequest>(swift::ExecuteSILPipelineRequest const&) + 317
26 sil-opt                  0x0000000102565a2b llvm::Expected<swift::ExecuteSILPipelineRequest::OutputType> swift::Evaluator::operator()<swift::ExecuteSILPipelineRequest, (void*)0>(swift::ExecuteSILPipelineRequest const&) + 43
27 sil-opt                  0x00000001025658be swift::executePassPipelinePlan(swift::SILModule*, swift::SILPassPipelinePlan const&, bool, swift::irgen::IRGenModule*) + 142
28 sil-opt                  0x000000010113c4c1 runCommandLineSelectedPasses(swift::SILModule*, swift::irgen::IRGenModule*) + 145
29 sil-opt                  0x000000010113a68a main + 5770
30 dyld                     0x0000000124ac84fe start + 462

[nate-chandler]

@swift-ci please clean test macos platform

[atrick]

Thanks