* configure.in, Makefile.in, common.mk: support DTrace on Solaris 10,

  based on r26235 by Yugui. On Solaris 10, low optimization level
  may also be needed, e.g. optflags="-xO1" or "-xO0" with Oracle
  SolarisStudio 12.3 cc.

* configure.in (--enable-dtrace): new option to enable/disable
  DTrace support. By default, trying to enable if dtrace command
  is found on the system. It is disabled when cross compiling.

* configure.in (RUBY_DTRACE_POSTPROCESS): new macro. checks whether
  the dtrace on the system needs postprocessing with "dtrace -G".
  The postprocessing is needed on Solaris 10 and other platforms.

* configure.in (RUBY_DTRACE_BSD_BROKEN): new macro. checks whether
  the dtrace supports USDT.

* configure.in (DTRACE): move after RUBY_DTRACE_POSTPROCESS.

* configure.in (LD): On Solaris, /usr/ccs/bin/ld is preferred.

* configure.in, Makefile.in, common.mk (DTRACE_OBJ): new macro for
  DTrace probe object generated by postprocessing with "dtrace -G".

* Makefile.in, common.mk (probes.$(OBJEXT)): DTrace probe object
  generated by the postprocessing. New file probes.stamp is for
  rebuilding related objects that may be modified by "dtrace -G".

* configure.in, Makefile.in, common.mk (DTRACE_GLOMMED_OBJ): new
  macro for DTrace static library hacks.

* configure.in, Makefile.in (LIBRUBY_A_OBJS): ditto.

* Makefile.in, common.mk (ruby-glommed.$(OBJEXT)): new target with
  rule for DTrace static library hacks.

* common.mk (DTRACE_DEPENDENT_OBJS): objects depended on probes.h.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37709 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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