[llvm] [SCEV] Fold (C1 * A /u C2) -> A /u (C2 /u C1), if C2 > C1. (PR #157656)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

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

Full details are available at: https://lab.llvm.org/buildbot/#/builders/59/builds/24048

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

```
Step 6 (test) failure: build (failure)
...
PASS: lldb-api :: functionalities/postmortem/elf-core/expr/TestExpr.py (571 of 2318)
PASS: lldb-api :: functionalities/postmortem/elf-core/gcore/TestGCore.py (572 of 2318)
PASS: lldb-api :: functionalities/postmortem/elf-core/thread_crash/TestLinuxCoreThreads.py (573 of 2318)
PASS: lldb-api :: functionalities/plugins/python_os_plugin/stepping_plugin_threads/TestOSPluginStepping.py (574 of 2318)
PASS: lldb-api :: functionalities/postmortem/minidump-new/TestMiniDumpNew.py (575 of 2318)
PASS: lldb-api :: functionalities/postmortem/minidump/TestMiniDump.py (576 of 2318)
PASS: lldb-api :: functionalities/postmortem/minidump-new/TestMiniDumpUUID.py (577 of 2318)
UNSUPPORTED: lldb-api :: functionalities/pre_run_dylibs/TestPreRunDylibs.py (578 of 2318)
PASS: lldb-api :: functionalities/postmortem/wow64_minidump/TestWow64MiniDump.py (579 of 2318)
UNRESOLVED: lldb-api :: functionalities/postmortem/netbsd-core/TestNetBSDCore.py (580 of 2318)
******************** TEST 'lldb-api :: functionalities/postmortem/netbsd-core/TestNetBSDCore.py' FAILED ********************
Script:
--
/usr/bin/python3.10 /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/dotest.py -u CXXFLAGS -u CFLAGS --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 --make /usr/bin/gmake --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 --cmake-build-type Release /home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/llvm-project/lldb/test/API/functionalities/postmortem/netbsd-core -p TestNetBSDCore.py
--
Exit Code: -6

Command Output (stdout):
--
lldb version 22.0.0git (https://github.com/llvm/llvm-project.git revision 70012fda6312ba87bc0bf9009402e0869a816d1f)
  clang revision 70012fda6312ba87bc0bf9009402e0869a816d1f
  llvm revision 70012fda6312ba87bc0bf9009402e0869a816d1f
Skipping the following test categories: ['libc++', 'msvcstl', 'dsym', 'gmodules', 'debugserver', 'objc']

--
Command Output (stderr):
--
PASS: LLDB (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/bin/clang-aarch64) :: test_aarch64_single_threaded (TestNetBSDCore.NetBSD1LWPCoreTestCase)
double free or corruption (fasttop)
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
 #0 0x0000e3b42768d7ac llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) Signals.cpp:0:0
 #1 0x0000e3b42768b2c8 llvm::sys::RunSignalHandlers() Signals.cpp:0:0
 #2 0x0000e3b42768e5c8 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #3 0x0000e3b42e3048f8 (linux-vdso.so.1+0x8f8)
 #4 0x0000e3b42e08f1f0 __pthread_kill_implementation ./nptl/./nptl/pthread_kill.c:44:76
 #5 0x0000e3b42e04a67c gsignal ./signal/../sysdeps/posix/raise.c:27:6
 #6 0x0000e3b42e037130 abort ./stdlib/./stdlib/abort.c:81:7
 #7 0x0000e3b42e083300 __libc_message ./libio/../sysdeps/posix/libc_fatal.c:154:6
 #8 0x0000e3b42e09956c ./malloc/./malloc/malloc.c:5668:3
 #9 0x0000e3b42e09b244 _int_free ./malloc/./malloc/malloc.c:4700:5
#10 0x0000e3b42e09dc74 __libc_free ./malloc/./malloc/malloc.c:3394:3
#11 0x0000e3b427484154 ProcessElfCore::~ProcessElfCore() ProcessElfCore.cpp:0:0
#12 0x0000e3b4270d0b28 lldb_private::Target::DeleteCurrentProcess() Target.cpp:0:0
#13 0x0000e3b4270d2ab4 lldb_private::Target::Destroy() Target.cpp:0:0
#14 0x0000e3b426c7538c lldb::SBDebugger::DeleteTarget(lldb::SBTarget&) (/home/tcwg-buildbot/worker/lldb-aarch64-ubuntu/build/local/lib/python3.10/dist-packages/lldb/_lldb.cpython-310-aarch64-linux-gnu.so+0x578538c)
#15 0x0000e3b426db0da0 _wrap_SBDebugger_DeleteTarget(_object*, _object*) LLDBWrapPython.cpp:0:0
#16 0x0000b7bbf7943c64 (/usr/bin/python3.10+0x103c64)
#17 0x0000b7bbf793a240 _PyObject_MakeTpCall (/usr/bin/python3.10+0xfa240)
#18 0x0000b7bbf7931518 _PyEval_EvalFrameDefault (/usr/bin/python3.10+0xf1518)

```

</details>

https://github.com/llvm/llvm-project/pull/157656