* ggc-common.c (ggc_mark_rtx_children_1): Update for changed name
mangling.
The following changes are merged from pch-branch:
* doc/gty.texi (GTY Options): Document %a.
* gengtype.c (do_scalar_typedef): New function.
(process_gc_options): Handle `length' option.
(set_gc_used_type): A pointer to an array of structures doesn't
qualify as a pointer to a structure.
(output_escaped_param): Add `%a' escape.
(write_gc_structure_fields): Allow 'desc' on array of unions.
(main): Define `uint8', `jword' and `JCF_u2' as scalars; use
do_scalar_typedef.
* gengtype.h (NUM_PARAM): New definition.
(struct type): For TYPE_PARAM_STRUCT, allow multiple parameters.
* gengtype.c (find_param_structure): New.
(adjust_field_type): Handle param<n>_is option.
(process_gc_options): Detect use_params option. Update callers.
(set_gc_used_type): Add 'param' parameter, update callers. Handle
'use_params' option.
(open_base_files): Add splay-tree.h to list of files included.
(output_mangled_typename): New.
(write_gc_structure_fields): Update 'param' parameter to support
multiple parameters. Change name mangling. Allow parameterized
fields to have an apparent scalar type. Handle param<n>_is options,
use_param option.
(write_gc_marker_routine_for_structure): Update for change to name
mangling. Better guess the output file for parameterized types.
(write_gc_types): Update for change to name mangling.
(write_gc_root): Update for change to name mangling. Handle (ignore)
param<n>_is options.
* doc/gty.texi (GTY Options): Add description of param<n>_is
options, use_params option.
* ggc.h (ggc_mark_rtx): Update for changed name mangling.
* gengtype-lex.l: Produce token for param<n>_is.
* gengtype-yacc.y: Parse param<n>_is.
* gengtype.c (adjust_field_tree_exp): Don't name a variable 'rindex'.
* rtl.c: Update comment describing rtx_format.
* rtl.h (union rtunion): Separate definition and typedef.
(struct rtx_def): Use gengtype to mark.
* Makefile.in (gengtype.o): Also depend on rtl.def.
* ggc.h (ggc_mark_rtx_children): Delete prototype.
(ggc_mark_rtx): Change to alias of gengtype-generated routine.
* ggc-common.c (ggc_mark_rtx_children): Delete.
(ggc_mark_rtx_children_1): Delete.
(gt_ggc_m_rtx_def): Delete.
* gengtype.c (adjust_field_rtx_def): New.
(adjust_field_type): Call adjust_field_rtx_def.
(write_gc_structure_fields): Add 'default' case to switch if none
is specified; remove unused code.
* tree.h (struct tree_exp): Update for change to meaning
of special.
* gengtype.c (adjust_field_tree_exp): New function.
(adjust_field_type): Handle `tree_exp' special here.
(write_gc_structure_fields): Don't handle `tree_exp' special here.
Handle new `dot' option.
* gengtype.h: Make `info' a pointer-to-const.
* gengtype-yacc.y (yacc_ids): Use xasprintf.