llvm dev - Sep 2019 - Insert machine code based on metadata

Hello!
Would it be possible to detect a metadata inserted at beginning parsing stage
(at LLParser) to branch and add statements and then emit a machine code
(.byte/.word) at lower levels depending on whether or not if that metadata is
present? As far as I searched, the only way I could think of doing this is to
detect the metadata at an earlier stage, then pass a flag if the metadata was
present and use that flag to emit the extra machine codes.

Thanks
Kaarthik A.
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