(FIXED_REGISTERS): If XFmode enabled, hard reg st7 is fixed.
(ASM_OUTPUT_DOUBLE): Use REAL_VALUE_... macros.
(ASM_OUTPUT_FLOAT): Likewise.
(ASM_OUTPUT_LONG_DOUBLE): New macro.
(PRINT_REG):  Add size case 12.
(DEBUG_PRINT_REG):  Likewise.

From-SVN: r5572