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* elaborate.cxx (mutated_var_collector): Forward
traversal portion of calls to base class.
(mutated_var_collector::visit_arrayindex): Resolve
arrayindex-into-histogram expression as pe_long.
(typeresolution_info::visit_print_format): Traverse
into histogram if present.
* parse.cxx (parse_symbol): Handle parse ambiguity surrounding
print(@hist_op(...)[...]).
* staptree.cxx (traversing_visitor::visit_arrayindex): Visit
base member of arrayindex.
* translate.cxx (c_unparser::histogram_index_check): New method.
(var::hist): Fix bug.
(var::buckets): New method.
(stmt_expr::stmt_expr): Print with newline.
(c_unparser::load_map_indices): Handle indexing-histogram case.
(c_tmpcounter::visit_arrayindex): Likewise.
(c_unparser::visit_arrayindex): Likewise.
(c_tmpcounter_assignment::visit_arrayindex): Throw error when
user attempts to write to histogram bucket.
(c_unparser_assignment::visit_arrayindex): Likewise.
* testsuite/buildok/print_histogram_entry.stp: New test.
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