[PATCH] -ftime-report vs --disable-checking and --enable-checking

["Andrew Pinski" <pinskia at gmail dot com>]

Hi,
 We already warn to users about -ftime-report when checking is
enabled but it seems like a good thing to also warn about when assert
checking is DISABLED as the released compiler has assert checking
enabled so timings will not be the same as a released compiler.  I
also changed the --disable-checking to --enable-checking=release in
the warning about when checking is enabled so people get the correct
idea.

OK? Bootstrapped and tested on i686-linux-gnu with no regressions.

Thanks,
Andrew Pinski

ChangeLog:
      * timevar.c (timevar_print): Change reference of --disable-checking to
      --enable-checking=release.  Also warn if assert checking is disabled.

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