[RuntimeDyld] Drop the '.s' suffix off the COFF test case - the MIPS bot started

failing when the suffix was added.

I assume the lack of a '.s' suffix means that the test case just wasn't running
before, and it has never worked on MIPS. I'll investigate that tomorrow.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@250376 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/ExecutionEngine/RuntimeDyld/X86/COFF_x86_64.s b/test/ExecutionEngine/RuntimeDyld/X86/COFF_x86_64
similarity index 100%
rename from test/ExecutionEngine/RuntimeDyld/X86/COFF_x86_64.s
rename to test/ExecutionEngine/RuntimeDyld/X86/COFF_x86_64