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PR 2427.
* staptree.cxx (varuse_collecting_visitor::visit_embeddedcode):
Support /* pure */ declaration. Stop using __tvar_ naming hack.
(v_c_u::visit_print_format): Mark sprint and sprintf as
side-effect-free.
(deep_copy_visitor::visit_print_format): Propagate raw_components.
* stap.1.in: Document declaration.
* elaborate.cxx (semantic_pass_opt2): Verbose message tweak.
(dead_stmtexpr_remover): Extend for more aggressive optimization.
* tapsets.cxx (dwarf,mark_var_expanding_copy_visotor): Add
/* pure */ declaration to rvalue expansions.
* tapset/*.stp: Added /* pure */ declarations to many functions.
* testsuite/parseok/unparsers.stp: Propagate guru mode flag.
* testsuite/buildok/twentyfour.stp: New test.
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