* set the subregsize of OS_M64 SSE registers to R_SUBQ so we can
    differentiate between 64 bit and 128 bit (R_SUBMMWHOLE) SSE vector regs,
    and support spilling/assembling for R_SUBQ SSE registers (8 bytes)
    (mantis #23962)

    We currently never use the full 128 bit of an SSE register, and
    spilling for those hasn't been implemented yet either (R_SUBMMWHOLE
    SSE regs are spilled into a 4-byte temp currently -> can overwrite data)


git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@23700 3ad0048d-3df7-0310-abae-a5850022a9f2