[llvm] AMDGPU: Remove triple field from subtarget (PR #164208)

[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/26241

<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 'lld :: MachO/loh-parsing.s' FAILED ********************
Exit Code: 250

Command Output (stdout):
--
# RUN: at line 3
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/llvm-mc -filetype=obj -triple=arm64-apple-darwin /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/MachO/loh-parsing.s -o /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/MachO/Output/loh-parsing.s.tmp.o
# executed command: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/llvm-mc -filetype=obj -triple=arm64-apple-darwin /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/MachO/loh-parsing.s -o /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/MachO/Output/loh-parsing.s.tmp.o
# note: command had no output on stdout or stderr
# RUN: at line 4
ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings -arch arm64 -dylib /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/MachO/Output/loh-parsing.s.tmp.o -o /dev/null
# executed command: ld64.lld -arch x86_64 -platform_version macos 11.0 11.0 -syslibroot /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/MachO/Inputs/MacOSX.sdk -lSystem -fatal_warnings -arch arm64 -dylib /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/MachO/Output/loh-parsing.s.tmp.o -o /dev/null
# .---command stderr------------
# | terminate called after throwing an instance of 'std::system_error'
# |   what():  Resource temporarily unavailable
# | PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
# |  #0 0x000055e6378e99bf llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/lld+0x9799bf)
# |  #1 0x000055e6378e63c4 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
# |  #2 0x00007f633f8cf420 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x14420)
# |  #3 0x00007f633f1e200b raise /build/glibc-B3wQXB/glibc-2.31/signal/../sysdeps/unix/sysv/linux/raise.c:51:1
# |  #4 0x00007f633f1c1859 abort /build/glibc-B3wQXB/glibc-2.31/stdlib/abort.c:81:7
# |  #5 0x00007f633f59b8d1 (/lib/x86_64-linux-gnu/libstdc++.so.6+0x9e8d1)
# |  #6 0x00007f633f5a737c (/lib/x86_64-linux-gnu/libstdc++.so.6+0xaa37c)
# |  #7 0x00007f633f5a73e7 (/lib/x86_64-linux-gnu/libstdc++.so.6+0xaa3e7)
# |  #8 0x00007f633f5a7699 (/lib/x86_64-linux-gnu/libstdc++.so.6+0xaa699)
# |  #9 0x00007f633f59e6fd std::__throw_system_error(int) (/lib/x86_64-linux-gnu/libstdc++.so.6+0xa16fd)
# | #10 0x00007f633f5d40e1 (/lib/x86_64-linux-gnu/libstdc++.so.6+0xd70e1)
# | #11 0x000055e63ca9cbf5 std::thread::_State_impl<std::thread::_Invoker<std::tuple<llvm::parallel::detail::(anonymous namespace)::ThreadPoolExecutor::ThreadPoolExecutor(llvm::ThreadPoolStrategy)::'lambda'()>>>::_M_run() Parallel.cpp:0:0
# | #12 0x00007f633f5d3df4 (/lib/x86_64-linux-gnu/libstdc++.so.6+0xd6df4)
# | #13 0x00007f633f8c3609 start_thread /build/glibc-B3wQXB/glibc-2.31/nptl/pthread_create.c:478:7
# | #14 0x00007f633f2be353 __clone /build/glibc-B3wQXB/glibc-2.31/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:97:0
# `-----------------------------
# error: command failed with exit status: 250

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/164208