i386 installation and sparc build broken since 38 hours

[Andreas Gustafsson <gson%gson.org@localhost>]

Lars & others,

The installation phase of the automated NetBSD-current/i386 tests
has failed every time for the last 38 hours or so; the kernel
panics during set extraction with the message:

  kernel: supervisor trap page fault, code=0
  Stopped in pid 3816.1 (tar) at           c0309c04:      repe movsl  
(%esi),%es:(%edi)

For logs, see:

  
http://releng.NetBSD.org/b5reports/i386/commits-2012.01.html#2012.01.27.19.48.42

This started with the commit at CVS date 2012.01.27.19.48.38 with the
commit message:

  extending vmem(9) to be able to allocated resources for it's own needs.
  simplifying uvm_map handling (no special kernel entries anymore no relocking)
  make malloc(9) a thin wrapper around kmem(9)
  (with private interface for interrupt safety reasons)

  releng@ acknowledged

Also, the sparc build has been failing since the same time.

IMO, this breakage is of sufficient scope and duration to warrant
reverting the commit.
-- 
Andreas Gustafsson, gson%gson.org@localhost