AIX bootstrap failure due to libiberty configure ICE

[David Edelsohn]

	And the winner is: Jeff Law's RTL generation patch.

2002-06-10  Jeffrey Law  <law@redhat.com>

        * alias.c (static_reg_base_value): New to hold RTL for
        items allocated once per function for the aliasing code.
        (init_alias_once_per_function): Initialize static_reg_base_value.
        (init_alias_analysis): Avoid throw-away allocations of RTL by
        using pre-computed values in static_reg_base_value.
        * function.c (prepare_function_start): Call
        init_alias_once_per_function appropriately.
        * rtl.h (init_alias_once_per_function): Declare.
        * caller-save (init_caller_save): Restructure slightly to
        avoid lots of silly RTL generation.
        * expr.c (init_expr_once): Likewise.
        * reload1.c (reload_cse_regs_1): Allocate throw-away register
        RTL object here.  Pass it into children.
        (reload_cse_simplify_operands): Use passed-in register RTL
        object.
        (reload_cse_simplify): Pass through throw-away register
        RTL object.

With this patch, stage2 GCC ICEs when compiling the "const" configure test
from libiberty.  stage1 GCC does not ICE.  This is a regression and needs
to be fixed or the patch reverted.

	Currently, I cannot bootstrap the compiler to ensure that the
other patches being applied to the PowerPC description work properly with
AIX. 

David