[llvm] [RISCV][GISel] Support select vector store instrinsics (PR #165500)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-x86_64-debian` running on `lldb-x86_64-debian` while building `llvm` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/162/builds/34271

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

```
Step 6 (test) failure: build (failure) (timed out)
...
UNSUPPORTED: lldb-shell :: ScriptInterpreter/Lua/watchpoint_callback.test (3253 of 3263)
UNSUPPORTED: lldb-shell :: ScriptInterpreter/Lua/fail_breakpoint_oneline.test (3254 of 3263)
UNSUPPORTED: lldb-shell :: Process/Windows/exception_access_violation.cpp (3255 of 3263)
UNSUPPORTED: lldb-shell :: ScriptInterpreter/Lua/independent_state.test (3256 of 3263)
UNSUPPORTED: lldb-shell :: ScriptInterpreter/Python/Crashlog/last_exception_backtrace_crashlog.test (3257 of 3263)
UNSUPPORTED: lldb-shell :: ScriptInterpreter/Lua/partial_statements.test (3258 of 3263)
PASS: lldb-api :: terminal/TestEditlineCompletions.py (3259 of 3263)
PASS: lldb-api :: tools/lldb-dap/progress/TestDAP_Progress.py (3260 of 3263)
PASS: lldb-api :: commands/process/attach/TestProcessAttach.py (3261 of 3263)
PASS: lldb-api :: repl/clang/TestClangREPL.py (3262 of 3263)
command timed out: 2400 seconds without output running [b'ninja', b'-j', b'72', b'check-lldb'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=2481.719939

```

</details>

https://github.com/llvm/llvm-project/pull/165500