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Add support for controlling warnings/errors.
Add tests for iformat description errors.
* dev.scm (cload): New option #:diag.
* read.scm (<reader>): New member verify-iformat?.
(/parse-diagnostic, parse-warning): New functions.
(parse-error): Guts moved to /parse-diagnostic.
(/set-diagnostic-options!): New function.
(cpu-load): New arg diagnostic-options, all callers updated.
Recognize -w diagnostic-option-list.
* ifield.scm (ifields-base-ifields): Move here from iformat.scm.
(ifld-simple-ifields, ifields-simple-ifields): New function.
* insn.scm (/parse-insn-format-iflds): New function.
(/parse-insn-format): Guts moved to /parse-insn-format-iflds.
New arg isa, all callers updated. Do some basic validation of the
ifield list if requested.
* mach.scm (/sanity-check-insns): Improve error message text.
* doc/running.text: Document -w option.
* ifield.scm (/multi-ifield-parse): Initialize bitrange.