llvm dev - Jan 2019 - Problem with GenAsmMatcher: ($addr)

Hi all,

My instruction is something like "LDA ($5000),Y". So my argstr pattern
in
the td file is "($$$addr),Y". The problem is that I'm getting an
error from
tablegen -gen-asm-matcher:

error: unable to find operand: 'addr)'.

Then I looked at GenAsmMatcher.cpp and tried "($$${addr}),Y" but got
"error: unable to find operand: '$addr'"

So,

1. How do I fix this?
2. Is there any documentation on what the format of the argstr should be?
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