patch for compile/991229-3.c -O3 -fomit-frame-pointer -funroll-loops SH failure

[Jeffrey A Law]

  In message < 200002162012.UAA30288@phal.cygnus.co.uk >you write:
  > When doing the second loop optimization pass for 991229-3.c,
  > check_dbra_loop deletes the last insn that uses (reg:SI 62); unroll_loop
  > then proceeds to completely unroll the inner loop.   Thus, when scan_loop
  > processes the outer loop looking for movables, (reg:SI 62) is set in the 
  > last basic block, and the last use recorded in reg_n_info doesn't exist
  > anymore.
  > reg_in_basic_block_p currently aborts when it drops through to the end of
  > the function.  Here is a patch to fix this:
  > 
  > Wed Feb 16 20:06:58 2000  J"orn Rennecke <amylaar@cygnus.co.uk>
  > 
  > 	* loop.c (reg_in_basic_block_p): Don't abort when falling through
  > 	to the end of the function.
This is fine.  Though I would tweak the comment slightly by removing
"-- see gcc.c-torture ...".  We normally don't include that kind of stuff
in comments.  If someone tries to take the code out someday hopefully the
testsuite will trigger a failure or someone will have the good sense to
tell the contributor to check the archives for additional details about this
hunk of code.

Thanks,
jeff