a8db1fb9b5
This patch updates fir.coordinate_op to carry the field index as attributes instead of relying on getting it from the fir.field_index operations defining its operands. The rational is that FIR currently has a few operations that require DAGs to be preserved in order to be able to do code generation. This is the case of fir.coordinate_op, which requires its fir.field operand producer to be visible. This makes IR transformation harder/brittle, so I want to update FIR to get rid if this. Codegen/printer/parser of fir.coordinate_of and many tests need to be updated after this change.
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