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Fix parse tree pretty-printer.
* staptree.h (print_format): Add raw_components field.
* parse.cxx (parse_symbol): Set it.
* staptree.cxx (lex_cast_qstring): Copy it here too.
(binary_expression::print): Add a space around operator, due to
lexical ambiguity (expr % paren-expr) vs %( preprocessor op.
(array_in:: foreach_loop:: arrayindex::print): Print base as indexable.
(print_format::string_to_components): Use parse_error, not semantic.
(print_format::print): Properly quote formatting string. Print
histogram argument.
* translate.cxx (visit_print_format): Properly quote formatting string.
(varlock): Reword lock timeout error message.
* testsuite/buildok/printf.stp: Add some quoting troublemakers.
* testsuite/parseok/unparser.stp: New file.
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