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tc-arc.c:tokenize_arguments tweaks expression() parsing, controlling whether arc_parse_name does anything by setting X_op and X_md in the expressionS argument passed to expression(). I want to change expr() to always fully initialise its result, and that means either a special expression initialiser for arc, or controlling arc_parse_name by some other means. Since arc_parse_name already tests "assembling_insn" and no other code does, change "assembling_insn" to directly control arc_parse_name. Doing it this way also stops a possible uninitialised access to right.X_op from expr() in arc_parse_name with current gas. The next patch in this series will also stop such uninitialised accesses. * config/tc-arc.c (assembling_insn): Update comment. (tokenize_arguments): Don't set X_op and X_md to control expression(), instead just use assembling_insn. (md_operand): Similarly. (arc_parse_name): Don't test X_op and X_md. (md_assemble): Don't set assembling_insn here.
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