bootstrap of 3.4.1 RC1 failed on powerpc-ibm-aix4.3.3.0

[David Edelsohn]

	Did GCC 3.4.0 bootstrap on AIX 4.3.3?  GCC's use of forward
references in assembly language output is a long-standing problem on AIX.
However, GCC 3.4.1 RC1 bootstrap on AIX 5.1 and produces similar forward
references in libstdc++/src/strstream.s.

	IBM no longer supports AIX 4.3, so I have not been testing on that
target and it isn't a GCC evaluation platform for GCC 3.4.  I am not sure
what has changed in GCC or the AIX assembler to cause the problem.  You
should be able to disable thunks to work around the problem.

David