[llvm] [AArch64] Increase scatter overhead on Neoverse-V2 (PR #101296)

[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/1945

Here is the relevant piece of the build log for the reference:
```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'cross-project-tests :: debuginfo-tests/llgdb-tests/forward-declare-class.cpp' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
Running debugger
Debugger output was:

--
Command Output (stderr):
--
RUN: at line 1: /Users/buildbot/buildbot-root/x86_64-darwin/build/bin/clang --driver-mode=g++ --target=x86_64-apple-darwin23.6.0 -O0 -g /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/cross-project-tests/debuginfo-tests/llgdb-tests/forward-declare-class.cpp -c -o /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/projects/cross-project-tests/debuginfo-tests/llgdb-tests/Output/forward-declare-class.cpp.tmp.o
+ /Users/buildbot/buildbot-root/x86_64-darwin/build/bin/clang --driver-mode=g++ --target=x86_64-apple-darwin23.6.0 -O0 -g /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/cross-project-tests/debuginfo-tests/llgdb-tests/forward-declare-class.cpp -c -o /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/projects/cross-project-tests/debuginfo-tests/llgdb-tests/Output/forward-declare-class.cpp.tmp.o
RUN: at line 2: /Users/buildbot/buildbot-root/x86_64-darwin/llvm-project/cross-project-tests/debuginfo-tests/llgdb-tests/test_debuginfo.pl /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/cross-project-tests/debuginfo-tests/llgdb-tests/forward-declare-class.cpp /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/projects/cross-project-tests/debuginfo-tests/llgdb-tests/Output/forward-declare-class.cpp.tmp.o
+ /Users/buildbot/buildbot-root/x86_64-darwin/llvm-project/cross-project-tests/debuginfo-tests/llgdb-tests/test_debuginfo.pl /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/cross-project-tests/debuginfo-tests/llgdb-tests/forward-declare-class.cpp /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/projects/cross-project-tests/debuginfo-tests/llgdb-tests/Output/forward-declare-class.cpp.tmp.o
cat: /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/projects/cross-project-tests/debuginfo-tests/llgdb-tests/Output/forward-declare-class.cpp.gdb.output: No such file or directory

--

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


```

https://github.com/llvm/llvm-project/pull/101296