(__PTR_TO_INT, __INT_TO_PTR): Delete.

(enum processor_type): Add R8000.
(mips_isa_string, CC1_SPEC): Add mips4 to comment.
(CONDITIONAL_REGISTER_USAGE): Use SUBTARGET_CONDITIONAL_REGISTER_USAGE.
(SUBTARGET_CONDITIONAL_REGISTER_USAGE): New macro.
(ASM_SPEC, LINK_SPEC, CPP_SPEC): Add mips4 support.
(MIPS_TEMP[12]_REGNUM): Change to avoid clobbering 64bit abi
parameter registers.
(SMALL_INT, SMALL_INT_UNSIGNED, CONST_OK_FOR_LETTER_P): Fix for 64
bit host.
(ABI_64BIT): New macro.
(REG_PARM_STACK_SPACE): Use UNITS_PER_WORD not 4.
(GO_IF_LEGITIMATE_ADDRESS, CONSTANT_ADDRESS_P, LEGITIMATE_CONSTANT,
LEGITIMIZE_ADDRESS): Don't allow CONST addresses for Irix6.
(ASM_OUTPUT_FILENAME): New macro.
(ASM_OUTPUT_ADDR_DIFF_ELT): Add 64 bit ABI support.

From-SVN: r8862