HIDENAME() macro seems to be unimplementable in C. (HIDENAME() used
to use invalid token pasting using ## for the STDC case until gcc
started rejecting that; now it uses unportable token pasting using
juxtaposition in all cases.) This reduces use of HIDENAME() in the
kernel to only i386 and amd64 profiling code so that it doesn't bite
most kernels whenever gcc becomes stricter. Problems with HIDENAME()
in userland are smaller because userland mostly doesn't use strict
flags yet. There are some advantages to hiding the name of mcount,
but newer arches shouldn't do it; only amd64 does.
MFC after: 3 days
On second thoughts hide tmpstk better by staticizing it.
011a891406