[llvm] [AMDGPU] Make v2f32 legal for G_FNEG and G_FABS and pattern update (PR #195419)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-armv8-quick` running on `linaro-clang-armv8-quick` while building `llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/154/builds/31124

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: tools/llvm-reduce/reduce-operands-alloca.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
llvm-reduce --abort-on-invalid-reduction --delta-passes=operands-zero --test /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/FileCheck --test-arg --check-prefix=CHECK --test-arg /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/tools/llvm-reduce/reduce-operands-alloca.ll --test-arg --input-file /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/tools/llvm-reduce/reduce-operands-alloca.ll -o /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/test/tools/llvm-reduce/Output/reduce-operands-alloca.ll.tmp
# executed command: llvm-reduce --abort-on-invalid-reduction --delta-passes=operands-zero --test /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/FileCheck --test-arg --check-prefix=CHECK --test-arg /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/tools/llvm-reduce/reduce-operands-alloca.ll --test-arg --input-file /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/tools/llvm-reduce/reduce-operands-alloca.ll -o /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/test/tools/llvm-reduce/Output/reduce-operands-alloca.ll.tmp
# .---command stderr------------
# | *** Reducing Operands to zero (operands-zero)...
# |  **** SUCCESS | Saved new best reduction to /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/test/tools/llvm-reduce/Output/reduce-operands-alloca.ll.tmp
# | --------------------------------------------------------------------------------
# | *** Reducing Operands to zero (operands-zero)...
# | --------------------------------------------------------------------------------
# | Done reducing! Reduced testcase: /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/test/tools/llvm-reduce/Output/reduce-operands-alloca.ll.tmp
# `-----------------------------
# RUN: at line 2
/home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/tools/llvm-reduce/reduce-operands-alloca.ll --check-prefixes=CHECK,ZERO < /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/test/tools/llvm-reduce/Output/reduce-operands-alloca.ll.tmp
# executed command: /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/FileCheck /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/tools/llvm-reduce/reduce-operands-alloca.ll --check-prefixes=CHECK,ZERO
# RUN: at line 4
llvm-reduce --abort-on-invalid-reduction --delta-passes=operands-one --test /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/FileCheck --test-arg --check-prefix=CHECK --test-arg /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/tools/llvm-reduce/reduce-operands-alloca.ll --test-arg --input-file /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/tools/llvm-reduce/reduce-operands-alloca.ll -o /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/test/tools/llvm-reduce/Output/reduce-operands-alloca.ll.tmp
# executed command: llvm-reduce --abort-on-invalid-reduction --delta-passes=operands-one --test /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/FileCheck --test-arg --check-prefix=CHECK --test-arg /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/tools/llvm-reduce/reduce-operands-alloca.ll --test-arg --input-file /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/llvm/test/tools/llvm-reduce/reduce-operands-alloca.ll -o /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/test/tools/llvm-reduce/Output/reduce-operands-alloca.ll.tmp
# .---command stderr------------
# | *** Reducing Operands to one (operands-one)...
# | llvm-reduce: error: error emitting bitcode to file '/tmp/lit-tmp-7mvzac33/llvm-reduce-875b08.ll': No space left on device
# `-----------------------------
# error: command failed with exit status: 1

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/195419