altivec patches

[Aldy Hernandez]

>>>>> "Geoff" == Geoff Keating <geoffk@geoffk.org> writes:

 > DWARF_FRAME_REGISTERS was invented, so people could add registers
 > without breaking binary compatibility.

But as it stands now it's value can't be dynamic-- say, with an abi
flag-- because it's value is used in places where it is expected to be
a constant (array sizes un unwind-dw2.c).

I will remedy this situation in another patch.

Aldy