[llvm] [RISCV] Add fractional LMUL register classes for inline assembly. (PR #171278)

[LLVM Continuous Integration via llvm-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 `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/174/builds/28668

<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 'XRay-x86_64-linux :: TestCases/Posix/basic-filtering.cpp' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 4
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/./bin/clang  --driver-mode=g++ -fxray-instrument  -m64   -std=c++11 /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/compiler-rt/test/xray/TestCases/Posix/basic-filtering.cpp -o /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/runtimes/runtimes-bins/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Posix/Output/basic-filtering.cpp.tmp -g
# executed command: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/./bin/clang --driver-mode=g++ -fxray-instrument -m64 -std=c++11 /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/compiler-rt/test/xray/TestCases/Posix/basic-filtering.cpp -o /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/runtimes/runtimes-bins/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Posix/Output/basic-filtering.cpp.tmp -g
# note: command had no output on stdout or stderr
# RUN: at line 5
rm -f basic-filtering-*
# executed command: rm -f 'basic-filtering-*'
# note: command had no output on stdout or stderr
# RUN: at line 6
env XRAY_OPTIONS="patch_premain=true xray_mode=xray-basic verbosity=1      xray_logfile_base=basic-filtering-      xray_naive_log_func_duration_threshold_us=1000      xray_naive_log_max_stack_depth=2"  /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/runtimes/runtimes-bins/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Posix/Output/basic-filtering.cpp.tmp 2>&1 |      FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/compiler-rt/test/xray/TestCases/Posix/basic-filtering.cpp
# executed command: env 'XRAY_OPTIONS=patch_premain=true xray_mode=xray-basic verbosity=1      xray_logfile_base=basic-filtering-      xray_naive_log_func_duration_threshold_us=1000      xray_naive_log_max_stack_depth=2' /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/runtimes/runtimes-bins/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Posix/Output/basic-filtering.cpp.tmp
# note: command had no output on stdout or stderr
# executed command: FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/compiler-rt/test/xray/TestCases/Posix/basic-filtering.cpp
# note: command had no output on stdout or stderr
# RUN: at line 11
ls basic-filtering-* | head -1 | tr -d '\n' > /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/runtimes/runtimes-bins/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Posix/Output/basic-filtering.cpp.tmp.log
# executed command: ls 'basic-filtering-*'
# note: command had no output on stdout or stderr
# executed command: head -1
# note: command had no output on stdout or stderr
# executed command: tr -d '\n'
# note: command had no output on stdout or stderr
# RUN: at line 12
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/./bin/llvm-xray convert --symbolize --output-format=yaml -instr_map=/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/runtimes/runtimes-bins/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Posix/Output/basic-filtering.cpp.tmp      "/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/runtimes/runtimes-bins/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Posix/basic-filtering-basic-filtering.cpp.tmp.AOl64N" |      FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/compiler-rt/test/xray/TestCases/Posix/basic-filtering.cpp --check-prefix TRACE
# executed command: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/./bin/llvm-xray convert --symbolize --output-format=yaml -instr_map=/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/runtimes/runtimes-bins/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Posix/Output/basic-filtering.cpp.tmp '%{readfile:/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/runtimes/runtimes-bins/compiler-rt/test/xray/X86_64LinuxConfig/TestCases/Posix/Output/basic-filtering.cpp.tmp.log}'
# note: command had no output on stdout or stderr
# executed command: FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/compiler-rt/test/xray/TestCases/Posix/basic-filtering.cpp --check-prefix TRACE
# .---command stderr------------
# | /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/compiler-rt/test/xray/TestCases/Posix/basic-filtering.cpp:61:15: error: TRACE-NOT: excluded string found in input
# | // TRACE-NOT: - { type: 0, func-id: {{.*}}, function: {{.*filtered.*}}, {{.*}} }
# |               ^
# | <stdin>:10:2: note: found here
# |  - { type: 0, func-id: 1, function: 'filtered()', cpu: 0, thread: 790192, process: 790192, kind: function-enter, tsc: 1765343592950281319, data: '' }
# |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | 
# | Input file: <stdin>
# | Check file: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/compiler-rt/test/xray/TestCases/Posix/basic-filtering.cpp
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |           1: --- 
# | not:62       X~~~
# |           2: header: 
...

```

</details>

https://github.com/llvm/llvm-project/pull/171278