[llvm] [Hexagon] Add Hexagon Load Widening Pass (PR #116330)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-with-lto-ubuntu` running on `as-worker-91` while building `llvm` at step 7 "test-stage1-compiler".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/49/builds/874

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

```
Step 7 (test-stage1-compiler) failure: build (failure)
...
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using ld64.lld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/ld64.lld
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using wasm-ld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/wasm-ld
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/utils/lit/tests/lit.cfg:111: warning: Setting a timeout per test not supported. Requires the Python psutil module but it could not be found. Try installing it via pip or via your operating system's package manager.
 Some tests will be skipped and the --timeout command line argument will not work.
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using ld.lld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/ld.lld
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using lld-link: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/lld-link
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using ld64.lld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/ld64.lld
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:506: note: using wasm-ld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/wasm-ld
-- Testing: 82140 tests, 72 workers --
Testing:  0.. 10.. 20.. 30.. 40
FAIL: LLVM :: CodeGen/Hexagon/widen-not-load.ll (34968 of 82140)
******************** TEST 'LLVM :: CodeGen/Hexagon/widen-not-load.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 3: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/llc -march=hexagon -O2 -debug-only=hexagon-load-store-widening /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/test/CodeGen/Hexagon/widen-not-load.ll -o 2>&1 - | /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/FileCheck /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/test/CodeGen/Hexagon/widen-not-load.ll
+ /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/llc -march=hexagon -O2 -debug-only=hexagon-load-store-widening /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/test/CodeGen/Hexagon/widen-not-load.ll -o -
+ /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/FileCheck /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/test/CodeGen/Hexagon/widen-not-load.ll
/home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/test/CodeGen/Hexagon/widen-not-load.ll:7:16: error: CHECK-LABEL: expected string not found in input
; CHECK-LABEL: test1
               ^
<stdin>:1:1: note: scanning from here
llc: Unknown command line argument '-debug-only=hexagon-load-store-widening'. Try: '/home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/llc --help'
^
<stdin>:1:31: note: possible intended match here
llc: Unknown command line argument '-debug-only=hexagon-load-store-widening'. Try: '/home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/llc --help'
                              ^

Input file: <stdin>
Check file: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/test/CodeGen/Hexagon/widen-not-load.ll

-dump-input=help explains the following input dump.

Input was:
<<<<<<
           1: llc: Unknown command line argument '-debug-only=hexagon-load-store-widening'. Try: '/home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/llc --help' 
label:7'0     X~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ error: no match found
label:7'1                                   ?                                                                                                                                     possible intended match
           2: llc: Did you mean '--debug-pass=hexagon-load-store-widening'? 
label:7'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>>>>

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 

1 warning(s) in tests

```

</details>

https://github.com/llvm/llvm-project/pull/116330