[lldb] Add skipIfRemote to TestRV32MachOCorefile (#204022)
I'm getting a failure on the lldb-remote-linux-ubuntu bot, but the
ubuntu native bot works fine. The failure is a little difficult to
understand;
```
FAIL: LLDB (/home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/build/bin/clang-aarch64) :: test_riscv32_gpr_corefile_registers (TestRV32MachOCorefile.TestRV32MachOCorefile.test_riscv32_gpr_corefile_registers)
Log Files:
- /home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/build/lldb-test-build.noindex/macosx/riscv32-corefile/TestRV32MachOCorefile/Failure_test_riscv32_gpr_corefile_registers.log
======================================================================
FAIL: test_riscv32_gpr_corefile_registers (TestRV32MachOCorefile.TestRV32MachOCorefile.test_riscv32_gpr_corefile_registers)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/lldb/packages/Python/lldbsuite/test/decorators.py", line 544, in wrapper
return func(self, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/buildbot/worker/as-builder-9/lldb-remote-linux-ubuntu/llvm-project/lldb/test/API/macosx/riscv32-corefile/TestRV32MachOCorefile.py", line 28, in test_riscv32_gpr_corefile_registers
self.assertEqual(thread.GetNumFrames(), 2)
AssertionError: 1 != 2
```
So it's got _a_ corefile, is it possible a corefile from a previous run
is still being used on the remote tester system, from when this corefile
only had 1 frame? I'm not sure.
