* Makefile.in (timevar.o): Depend on flags.h.
* timevar.c (unused_stack_instances): New variable.
(timevar_push): Take a timevar_stack_def from
unused_stack_instances if available.
(timevar_pop): Push the popped timevar_stack_def onto
unused_stack_instances.
(TIMEVAR_ENABLE): New macro.
(timevar_def): Make standalone a 1-bit field. Add field used.
(get_time): Rename parameter to now. Return after clearing it if
not TIMEVAR_ENABLE.
(init_timevar): Do nothing if not TIMEVAR_ENABLE.
(timevar_pop): Likewise.
(timevar_stop): Likewise.
(timevar_push): Likewise. Mark the timing variable as used.
(timevar_start): Likewise.
(timevar_print): Do nothing if not TIMEVAR_ENABLE. Don't print
timevars that were never used.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@33504
138bc75d-0d04-0410-961f-
82ee72b054a4