[clang] [llvm] [Hexagon] Add XQFloat code generation and post-RA QFP handling (PR #198902)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-gcc-ubuntu` running on `sie-linux-worker3` while building `clang,llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/174/builds/37447

<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 'lit :: shtest-keyword-parse-errors.py' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
not env -u FILECHECK_OPTS "/usr/bin/python3.8" /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical -vv Inputs/shtest-keyword-parse-errors > /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/utils/lit/tests/Output/shtest-keyword-parse-errors.py.tmp.out
# executed command: not env -u FILECHECK_OPTS /usr/bin/python3.8 /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical -vv Inputs/shtest-keyword-parse-errors
# note: command had no output on stdout or stderr
# RUN: at line 2
FileCheck -input-file /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/utils/lit/tests/Output/shtest-keyword-parse-errors.py.tmp.out /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/utils/lit/tests/shtest-keyword-parse-errors.py
# executed command: FileCheck -input-file /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/utils/lit/tests/Output/shtest-keyword-parse-errors.py.tmp.out /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/utils/lit/tests/shtest-keyword-parse-errors.py
# .---command stderr------------
# | /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/utils/lit/tests/shtest-keyword-parse-errors.py:11:16: error: CHECK-LABEL: expected string not found in input
# | # CHECK-LABEL: UNRESOLVED: shtest-keyword-parse-errors :: multiple-allow-retries.txt
# |                ^
# | /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/utils/lit/tests/Output/shtest-keyword-parse-errors.py.tmp.out:6:53: note: scanning from here
# | UNRESOLVED: shtest-keyword-parse-errors :: empty.txt (2 of 3)
# |                                                     ^
# | /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/utils/lit/tests/Output/shtest-keyword-parse-errors.py.tmp.out:17:2: note: possible intended match here
# |  shtest-keyword-parse-errors :: multiple-allow-retries.txt
# |  ^
# | 
# | Input file: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/utils/lit/tests/Output/shtest-keyword-parse-errors.py.tmp.out
# | Check file: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/utils/lit/tests/shtest-keyword-parse-errors.py
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |             1: -- Testing: 3 tests, 1 workers -- 
# | check:6           ^~~~~~~~~~~~~~~~
# |             2: UNRESOLVED: shtest-keyword-parse-errors :: multiple-allow-retries.txt (1 of 3) 
# |             3: ******************** TEST 'shtest-keyword-parse-errors :: multiple-allow-retries.txt' FAILED ******************** 
# |             4: Test has more than one ALLOW_RETRIES lines 
# |             5: ******************** 
# |             6: UNRESOLVED: shtest-keyword-parse-errors :: empty.txt (2 of 3) 
# | label:8'0      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | label:8'1      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | label:11'0                                                        {            search range start (exclusive)
# | label:11'1                                                                     error: no match found in search range
# |             7: ******************** TEST 'shtest-keyword-parse-errors :: empty.txt' FAILED ******************** 
# |             8: Test has no 'RUN:' line 
# |             9: ******************** 
# |            10: UNRESOLVED: shtest-keyword-parse-errors :: unterminated-run.txt (3 of 3) 
# |            11: ******************** TEST 'shtest-keyword-parse-errors :: unterminated-run.txt' FAILED ******************** 
# |            12: Test has unterminated 'RUN:' directive (with '\') at line 1 
# |            13: ******************** 
# |            14: ******************** 
# |            15: Unresolved Tests (3): 
...

```

</details>

https://github.com/llvm/llvm-project/pull/198902