[llvm] [InstCombine] Check for undef first before freeze (PR #96769)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-arm64-windows-msvc` running on `linaro-armv8-windows-msvc-04` while building `llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/161/builds/567

Here is the relevant piece of the build log for the reference:
```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'Clangd :: crash-parse.test' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
not --crash clangd -lit-test < C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\llvm\clang-tools-extra\clangd\test\crash-parse.test 2> C:\Users\tcwg\llvm-worker\clang-arm64-windows-msvc\stage1\tools\clang\tools\extra\clangd\test\Output\crash-parse.test.tmp.err
# executed command: not --crash clangd -lit-test
# .---command stdout------------
# | Content-Length: 3402
# | 
# | {
# |   "id": 0,
# |   "jsonrpc": "2.0",
# |   "result": {
# |     "capabilities": {
# |       "astProvider": true,
# |       "callHierarchyProvider": true,
# |       "clangdInlayHintsProvider": true,
# |       "codeActionProvider": true,
# |       "compilationDatabase": {
# |         "automaticReload": true
# |       },
# |       "completionProvider": {
# |         "resolveProvider": false,
# |         "triggerCharacters": [
# |           ".",
# |           "<",
# |           ">",
# |           ":",
# |           "\"",
# |           "/",
# |           "*"
# |         ]
# |       },
# |       "declarationProvider": true,
# |       "definitionProvider": true,
# |       "documentFormattingProvider": true,
# |       "documentHighlightProvider": true,
# |       "documentLinkProvider": {
# |         "resolveProvider": false
# |       },
# |       "documentOnTypeFormattingProvider": {
# |         "firstTriggerCharacter": "\n",
# |         "moreTriggerCharacter": []
# |       },
# |       "documentRangeFormattingProvider": true,
# |       "documentSymbolProvider": true,
# |       "executeCommandProvider": {
# |         "commands": [
...

```

https://github.com/llvm/llvm-project/pull/96769