[llvm] [SCCP] Support constant structure in PhiNode (PR #163713)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-aarch64-windows` running on `linaro-armv8-windows-msvc-05` while building `llvm` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/141/builds/12364

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

```
Step 6 (test) failure: build (failure)
...
UNSUPPORTED: lldb-api :: macosx/unregistered-macho/TestUnregisteredMacho.py (1088 of 2314)
PASS: lldb-api :: macosx/version_zero/TestGetVersionZeroVersion.py (1089 of 2314)
UNSUPPORTED: lldb-api :: pointer-nonaddressable-bits/TestArmPointerMetadataStripping.py (1090 of 2314)
PASS: lldb-api :: python_api/absolute_symbol/TestAbsoluteSymbol.py (1091 of 2314)
PASS: lldb-api :: python_api/address_range/TestAddressRange.py (1092 of 2314)
XFAIL: lldb-api :: python_api/basename/TestGetBaseName.py (1093 of 2314)
PASS: lldb-api :: python_api/breakpoint/TestBreakpointAPI.py (1094 of 2314)
UNSUPPORTED: lldb-api :: python_api/class_members/TestSBTypeClassMembers.py (1095 of 2314)
PASS: lldb-api :: python_api/compile_unit/TestCompileUnitAPI.py (1096 of 2314)
TIMEOUT: lldb-api :: functionalities/step-vrs-interrupt/TestStepVrsInterruptTimeout.py (1097 of 2314)
******************** TEST 'lldb-api :: functionalities/step-vrs-interrupt/TestStepVrsInterruptTimeout.py' FAILED ********************
Script:
--
C:/Users/tcwg/scoop/apps/python/current/python.exe C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/llvm-project/lldb\test\API\dotest.py -u CXXFLAGS -u CFLAGS --env LLVM_LIBS_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./lib --env LLVM_INCLUDE_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/include --env LLVM_TOOLS_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin --arch aarch64 --build-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex --lldb-module-cache-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex/module-cache-lldb\lldb-api --clang-module-cache-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex/module-cache-clang\lldb-api --executable C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/lldb.exe --compiler C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/clang.exe --dsymutil C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/dsymutil.exe --make C:/Users/tcwg/scoop/shims/make.exe --llvm-tools-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin --lldb-obj-root C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/tools/lldb --lldb-libs-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./lib --cmake-build-type Release --skip-category=watchpoint C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\API\functionalities\step-vrs-interrupt -p TestStepVrsInterruptTimeout.py
--
Exit Code: 15
Timeout: Reached timeout of 600 seconds

Command Output (stdout):
--
lldb version 22.0.0git (https://github.com/llvm/llvm-project.git revision a3082c9d9004e2017c86a76cdf91ba02d2f84bce)
  clang revision a3082c9d9004e2017c86a76cdf91ba02d2f84bce
  llvm revision a3082c9d9004e2017c86a76cdf91ba02d2f84bce

--

********************
PASS: lldb-api :: python_api/default-constructor/TestDefaultConstructorForAPIObjects.py (1098 of 2314)
PASS: lldb-api :: python_api/disassemble-raw-data/TestDisassembleRawData.py (1099 of 2314)
PASS: lldb-api :: python_api/disassemble-raw-data/TestDisassemble_VST1_64.py (1100 of 2314)
PASS: lldb-api :: python_api/debugger/TestDebuggerAPI.py (1101 of 2314)
UNSUPPORTED: lldb-api :: python_api/event/TestEvents.py (1102 of 2314)
UNSUPPORTED: lldb-api :: python_api/exprpath_synthetic/TestExprPathSynthetic.py (1103 of 2314)
PASS: lldb-api :: python_api/file_handle/TestFileHandle.py (1104 of 2314)
PASS: lldb-api :: python_api/find_in_memory/TestFindInMemory.py (1105 of 2314)
PASS: lldb-api :: python_api/findvalue_duplist/TestSBFrameFindValue.py (1106 of 2314)
PASS: lldb-api :: python_api/format/TestFormat.py (1107 of 2314)
PASS: lldb-api :: python_api/find_in_memory/TestFindRangesInMemory.py (1108 of 2314)
PASS: lldb-api :: python_api/formatters/TestFormattersSBAPI.py (1109 of 2314)
PASS: lldb-api :: python_api/frame/get-variables/TestGetVariables.py (1110 of 2314)
PASS: lldb-api :: python_api/frame/TestFrames.py (1111 of 2314)
PASS: lldb-api :: python_api/frame/inlines/TestInlinedFrame.py (1112 of 2314)
UNSUPPORTED: lldb-api :: python_api/function_symbol/TestDisasmAPI.py (1113 of 2314)
UNSUPPORTED: lldb-api :: python_api/function_symbol/TestSymbolAPI.py (1114 of 2314)
PASS: lldb-api :: python_api/get-value-32bit-int/TestGetValue32BitInt.py (1115 of 2314)
UNSUPPORTED: lldb-api :: python_api/global_module_cache/TestGlobalModuleCache.py (1116 of 2314)
PASS: lldb-api :: python_api/interpreter/TestCommandInterpreterAPI.py (1117 of 2314)
PASS: lldb-api :: python_api/interpreter/TestCommandOverrideCallback.py (1118 of 2314)
PASS: lldb-api :: python_api/interpreter/TestRunCommandInterpreterAPI.py (1119 of 2314)

```

</details>

https://github.com/llvm/llvm-project/pull/163713