[llvm] [RISCV][NFC] Match `3/5/9 * 3/5/9 * 2^N` without a loop (PR #165547)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-darwin` running on `doug-worker-3` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/23/builds/15249

<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 'Clang :: Driver/sparc-float.c' FAILED ********************
Exit Code: 127

Command Output (stdout):
--
# RUN: at line 5
/Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/bin/clang -c /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/Driver/sparc-float.c -### -o /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/tools/clang/test/Driver/Output/sparc-float.c.tmp.o 2>&1      -target sparc-linux-gnu    | /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/bin/FileCheck --check-prefix=CHECK-DEF /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/Driver/sparc-float.c
# executed command: /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/bin/clang -c /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/Driver/sparc-float.c '-###' -o /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/tools/clang/test/Driver/Output/sparc-float.c.tmp.o -target sparc-linux-gnu
# .---command stderr------------
# | Could not create process (/Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/bin/clang) due to [Errno 24] Too many open files
# `-----------------------------
# error: command failed with exit status: 127

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/165547