[Mips]Work around MIPS linker issues exposed by commit r198087 until bug 18360 is resolved

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198451 91177308-0d34-0410-b5e6-96231b3b80d8
Add a LLVM_DUMP_METHOD macro.

The motivation is to mark dump methods as used in debug builds so that they can
be called from lldb, but to not do so in release builds so that they can be
dead-stripped.

There's lots of potential follow-up work suggested in the thread
"Should dump methods be LLVM_ATTRIBUTE_USED only in debug builds?" on cfe-dev,
but everyone seems to agreen on this subset.

Macro name chosen by fair coin toss.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198456 91177308-0d34-0410-b5e6-96231b3b80d8