big slowdown in egcs-1.1.2->gcc-2.95 on alpha

[Brad Lucier]

> Here's something for the calls to bitmap_bit_p.
> r~

Great progress today!  Without any of the changes:

time in global-alloc: 882.922784 (88%)

With Joern's change and declaring the bit argument to bitmap_bit_p to
be unsigned int instead of int (sorry, I didn't prepare a patch for bitmap.c
and bitmap.h):

time in global-alloc: 242.692160 (67%)

With Richard's change:

time in global-alloc: 118.366352 (50%)

Thanks!

Brad