Minor speedup

[law@redhat.com]

In message <20020608044530.J13411@devserv.devel.redhat.com>, Jakub Jelinek writ
es:
 > On Fri, Jun 07, 2002 at 12:03:38PM -0600, law@redhat.com wrote:
 > > 
 > > I got some interesting data yesterday from profiling the PA port building
 > > my 162 testfiles at -O2.  Here's a trivial fix which improves compile time
 > s
 > > by just shy of 1%.
 > > 
 > > Basically we're doing an insane number of calls into free_INSN_LIST_list,
 > > on the order of 90 million.  Roughly 55 million are calls to free an empty
 > > list from within free_deps.  Opps.
 > 
 > But then for the remaining 35 million calls the list is checked for NULL
 > twice. Wouldn't be better to go over gcc sources and put performance critica
 > l
 > very short routines into headers as inlines (provided we're building
 > with gcc and optimizing)?
Basically we'd have to expose the free element cache outside lists.c which
seems like a bad idea.  We use this cache to avoid lots of silly 
allocations.

jeff