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PR 1172.
* staptree.h, staptree.cxx: Make all ::print*(), operator<<
functions take const staptree objects.
(literal_string::print): \-prefix double-quotes.
* translate.cxx (emit_common_header): Add context probe_point field.
Switch to atomic_t busy flags.
(emit_module_exit): Use atomic operations for busy flag.
(visit_*): Use lex_cast_qstring for last_stmt strings.
* tapsets.cxx (lex_cast_quoted): \-prefix double-quotes too.
(*::emit_probe_entries): Populate probe_point. Use atomic operations
for busy flag.
* tapset/context.stp (pp): New function.
* stapfuncs.5.in: Document it.
* testsuite/buildok/context_test.stp: Test it.
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