Clean up multi-line asam string printing. Instead of printing:

        # InlineAsm Start
        subfc r3,r5,r4
                subfze r4,r3
        # InlineAsm End

print:

        # InlineAsm Start
        subfc r3,r5,r4
        subfze r4,r3
        # InlineAsm End

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36589 91177308-0d34-0410-b5e6-96231b3b80d8