[clang] [OpenMP] Restore loop variable values after loop-transformation constructs. (PR #212853)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `intel-sycl-gpu` running on `intel-sycl-gpu-01` while building `clang` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/225/builds/14090

<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 'libomptarget :: spirv64-intel :: offloading/target-tile.c' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 4
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./bin/clang -fopenmp    -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/offload/test -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src -L /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./lib/x86_64-unknown-linux-gnu -L /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./lib/x86_64-unknown-linux-gnu -L /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./lib -L /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src  -Wl,-rpath,/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./lib/x86_64-unknown-linux-gnu -Wl,-rpath,/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src -Wl,-rpath,/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./lib/x86_64-unknown-linux-gnu -Wl,-rpath,/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./lib  -fopenmp-targets=spirv64-intel /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/offload/test/offloading/target-tile.c -o /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/offload/test/spirv64-intel/offloading/Output/target-tile.c.tmp -fopenmp-version=51
# executed command: /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./bin/clang -fopenmp -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/offload/test -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src -L /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./lib/x86_64-unknown-linux-gnu -L /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./lib/x86_64-unknown-linux-gnu -L /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./lib -L /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src -Wl,-rpath,/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./lib/x86_64-unknown-linux-gnu -Wl,-rpath,/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src -Wl,-rpath,/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./lib/x86_64-unknown-linux-gnu -Wl,-rpath,/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./lib -fopenmp-targets=spirv64-intel /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/offload/test/offloading/target-tile.c -o /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/offload/test/spirv64-intel/offloading/Output/target-tile.c.tmp -fopenmp-version=51
# RUN: at line 5
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/offload/test/spirv64-intel/offloading/Output/target-tile.c.tmp 2>&1 | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./bin/FileCheck /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/offload/test/offloading/target-tile.c
# executed command: /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/offload/test/spirv64-intel/offloading/Output/target-tile.c.tmp
# note: command had no output on stdout or stderr
# error: command failed with exit status: 1
# executed command: /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./bin/FileCheck /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/offload/test/offloading/target-tile.c
# .---command stderr------------
# | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/offload/test/offloading/target-tile.c:59:12: error: CHECK: expected string not found in input
# |  // CHECK: success
# |            ^
# | <stdin>:1:1: note: scanning from here
# | error: i = 16, expected 15
# | ^
# | <stdin>:1:18: note: possible intended match here
# | error: i = 16, expected 15
# |                  ^
# | 
# | Input file: <stdin>
# | Check file: /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/offload/test/offloading/target-tile.c
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             1: error: i = 16, expected 15 
# | check:59'0    {                           } search range (exclusive bounds)
# | check:59'1                                  error: no match found in search range
# | check:59'2                      ?           possible intended match
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/212853