[llvm] [VPlan] Use frozen combined condition in early exit first-active-lane (PR #223643)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lld-x86_64-ubuntu-fast` running on `as-builder-4` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/33/builds/45652

<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/LoopVectorize/early-exit-live-out-extract-lane.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/buildbot/worker/lld-x86_64/build/bin/opt -p loop-vectorize -force-vector-width=1 -force-vector-interleave=2 -S /home/buildbot/worker/lld-x86_64/llvm-project/llvm/test/Transforms/LoopVectorize/early-exit-live-out-extract-lane.ll | /home/buildbot/worker/lld-x86_64/build/bin/FileCheck --check-prefix=VF1IC2 /home/buildbot/worker/lld-x86_64/llvm-project/llvm/test/Transforms/LoopVectorize/early-exit-live-out-extract-lane.ll
# executed command: /home/buildbot/worker/lld-x86_64/build/bin/opt -p loop-vectorize -force-vector-width=1 -force-vector-interleave=2 -S /home/buildbot/worker/lld-x86_64/llvm-project/llvm/test/Transforms/LoopVectorize/early-exit-live-out-extract-lane.ll
# executed command: /home/buildbot/worker/lld-x86_64/build/bin/FileCheck --check-prefix=VF1IC2 /home/buildbot/worker/lld-x86_64/llvm-project/llvm/test/Transforms/LoopVectorize/early-exit-live-out-extract-lane.ll
# .---command stderr------------
# | /home/buildbot/worker/lld-x86_64/llvm-project/llvm/test/Transforms/LoopVectorize/early-exit-live-out-extract-lane.ll:147:16: error: VF1IC2-NEXT: expected string not found in input
# | ; VF1IC2-NEXT: [[TMP13:%.*]] = icmp eq i1 [[TMP6]], false
# |                ^
# | <stdin>:86:20: note: scanning from here
# |  %12 = mul i8 %4, 7
# |                    ^
# | <stdin>:86:20: note: with "TMP6" equal to "%6"
# |  %12 = mul i8 %4, 7
# |                    ^
# | <stdin>:86:20: note: pattern attempts to capture variables: "TMP13"
# |  %12 = mul i8 %4, 7
# |                    ^
# | <stdin>:87:2: note: possible intended match here
# |  %13 = icmp eq i1 %8, false
# |  ^
# | 
# | Input file: <stdin>
# | Check file: /home/buildbot/worker/lld-x86_64/llvm-project/llvm/test/Transforms/LoopVectorize/early-exit-live-out-extract-lane.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             .
# |             .
# |             .
# |            81: middle.block: ; preds = %vector.body.interim 
# |            82:  br label %exit 
# |            83:  
# |            84: vector.early.exit: ; preds = %vector.body 
# |            85:  %11 = mul i8 %3, 7 
# |            86:  %12 = mul i8 %4, 7 
# | next:147'0                       {   search range start (exclusive)
# | next:147'1                           error: no match found in search range
# | next:147'2                           with "TMP6" equal to "%6"
# | next:147'3                           pattern attempts to capture variables: "TMP13"
# |            87:  %13 = icmp eq i1 %8, false 
# | next:147'4      ?                            possible intended match
# |            88:  %14 = zext i1 %13 to i64 
# |            89:  %15 = add i64 1, %14 
...

```

</details>

https://github.com/llvm/llvm-project/pull/223643