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PR 2060 etc.
* tapsets.cxx (visit_target_symbol): Tolerate failed resolution by
letting target_symbol instance pass through to optimizer and
type checker.
* elaborate.cxx (semantic_pass_optimize): New family of functions and
associated visitor classes.
(visit_for_loop): Tolerate absent init/incr clauses.
(semantic_pass): Invoke unless unoptimized (-u) option given.
* main.cxx, session.h: Add support for flag.
* staptree.cxx (visit_for_loop): Tolerate absent init/incr clauses.
(traversing_visitor::visit_arrayindex): Visit the index expressions.
(functioncall_traversing_visitor): New class.
(varuse_tracking_visitor): New class.
* staptree.h: Corresponding changes.
* parse.cxx (parse_for_loop): Represent absent init/incr expressions
with null statement pointer instead of optimized-out dummy numbers.
* stap.1.in: Document optimization.
* testsuite/{semko,transko}/*.stp: Added "-u" or other code to many
tests to check bad code without optimizer elision.
* testsuite/semok/optimize.stp: New test.
* elaborate.cxx (unresolved, invalid, mismatch): Standardize error
message wording.
* stapfuncs.5.in: Tweak print/printf docs.
* tapset/logging.stp: Remove redundant "print" auxiliary function,
since it's a translator built-in.
* testsuite/transok/five.stp: Extend test.
* translate.cxx (emit_symbol_data): Put symbol table into a separate
temporary header file, to make "-p3" output easier on the eyes.
* buildrun.cxx (compile_pass): Eliminate test-mode support throughout.
* main.cxx, session.h, translate.cxx: Ditto.
* main.cxx (main): For last-pass=2 runs, print post-optimization ASTs.
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