[clang] [ObjC][CodeGen] Assume a for-in loop is in bounds and cannot overflow (PR #94885)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-aarch64-ubuntu` running on `linaro-lldb-aarch64-ubuntu` while building `clang` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/59/builds/1385

Here is the relevant piece of the build log for the reference:
```
Step 6 (test) failure: build (failure)
...
PASS: lldb-api :: functionalities/thread/concurrent_events/TestConcurrentDelayWatchBreak.py (612 of 1992)
PASS: lldb-api :: functionalities/thread/concurrent_events/TestConcurrentDelayedCrashWithBreakpointWatchpoint.py (613 of 1992)
PASS: lldb-api :: functionalities/thread/concurrent_events/TestConcurrentDelayedCrashWithBreakpointSignal.py (614 of 1992)
PASS: lldb-api :: functionalities/progress_reporting/TestTrimmedProgressReporting.py (615 of 1992)
PASS: lldb-api :: functionalities/thread/concurrent_events/TestConcurrentManyCrash.py (616 of 1992)
PASS: lldb-api :: functionalities/thread/concurrent_events/TestConcurrentManyBreakpoints.py (617 of 1992)
PASS: lldb-api :: functionalities/thread/concurrent_events/TestConcurrentSignalBreak.py (618 of 1992)
PASS: lldb-api :: functionalities/thread/concurrent_events/TestConcurrentNWatchNBreak.py (619 of 1992)
PASS: lldb-api :: functionalities/thread/concurrent_events/TestConcurrentSignalDelayBreak.py (620 of 1992)
PASS: lldb-api :: functionalities/thread/concurrent_events/TestConcurrentSignalDelayWatch.py (621 of 1992)
FAIL: lldb-api :: functionalities/thread/concurrent_events/TestConcurrentSignalNWatchNBreak.py (622 of 1992)
******************** TEST 'lldb-api :: functionalities/thread/concurrent_events/TestConcurrentSignalNWatchNBreak.py' FAILED ********************
Script:
--
/usr/bin/python3.8 /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/dotest.py -u CXXFLAGS -u CFLAGS --env ARCHIVER=/usr/local/bin/llvm-ar --env OBJCOPY=/usr/bin/llvm-objcopy --env LLVM_LIBS_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./lib --env LLVM_INCLUDE_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/include --env LLVM_TOOLS_DIR=/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin --arch aarch64 --build-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build.noindex --lldb-module-cache-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build.noindex/module-cache-lldb/lldb-api --clang-module-cache-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/lldb-test-build.noindex/module-cache-clang/lldb-api --executable /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/lldb --compiler /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/clang --dsymutil /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin/dsymutil --llvm-tools-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./bin --lldb-obj-root /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/tools/lldb --lldb-libs-dir /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/./lib /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/functionalities/thread/concurrent_events -p TestConcurrentSignalNWatchNBreak.py
--
Exit Code: 1

Command Output (stdout):
--
lldb version 19.0.0git (https://github.com/llvm/llvm-project.git revision eb61956d1a039d9cb03e0d041f33ab2ecc80519e)
  clang revision eb61956d1a039d9cb03e0d041f33ab2ecc80519e
  llvm revision eb61956d1a039d9cb03e0d041f33ab2ecc80519e
Skipping the following test categories: ['libc++', 'dsym', 'gmodules', 'debugserver', 'objc']

Watchpoint 1 hit:
old value: 0
new value: 1

Watchpoint 1 hit:
old value: 1
new value: 1

Watchpoint 1 hit:
old value: 1
new value: 1

Watchpoint 1 hit:
old value: 1
new value: 1

Watchpoint 1 hit:
old value: 1
new value: 1

--
Command Output (stderr):
--
FAIL: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test (TestConcurrentSignalNWatchNBreak.ConcurrentSignalNWatchNBreak)

```

https://github.com/llvm/llvm-project/pull/94885