PATCH: support for CGEN string-macro insns

[Alan Modra]

On Mon, 2 Apr 2001, Greg McGary wrote:

> 	* tc.h (md_assemble): Conditionalize return-value decl.
> 	* read.c (read_a_source_file): Repackage macro-listing code as
> 	separate function.  Handle CGEN string macro expansion.
> 	(maybe_print_macro_listing): New function.

OK for mainline.

Alan Modra
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