Linux/sparc segfault

[Will N. <wi...@mi...>]

The segfault on Linux/sparc seems to be caused by the manual allocation of 
registers in lispbibl.d. In lispbibl.d there is the following table:

  # Overview of use of registers in gcc terminology:
  # fixed: mentioned in FIXED_REGISTERS
  # used:  mentioned in CALL_USED_REGISTERS but not FIXED_REGISTERS
  #                     (i.e. caller-saved)
  # save:  otherwise (i.e. call-preserved, callee-saved)
  #
  #               STACK    mv_count  value1   subr_self
  # MC680X0       used
  # I80386        save
  # SPARC         fixed    fixed     fixed    used

According to the above definition all the sparc registers used (g4, g5, g6, 
g7) should be of type used. In the gcc source code the registers are all 
specified in both FIXED and CALL_USED, but I am not yet sure what exactly 
that means.

Disabling the register allocation code allows the compile to proceed with 
full optimization. I have attached a trivial patch.