message: Add missing triple from llvm-mc command line.
diff: // Test that we can display S_CONSTANT records.
  -// RUN: llvm-mc -filetype=obj %p/Inputs/s_constant.s > %t.obj
  +// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-win32 %p/Inputs/s_constant.s > %t.obj
  // RUN: lld-link /DEBUG /nodefaultlib /entry:main /OUT:%t.exe /PDB:%t.pdb -- %t.obj
  // RUN: env LLDB_USE_NATIVE_PDB_READER=1 lldb -f %t.exe -s \
  // RUN: %p/Inputs/s_constant.lldbinit | FileCheck %s
  