Ensure that ia32 build passes all tests with --use-ssa on.

Ensure that ia32 build passes all tests with --use-ssa on.

Bugs fixed in register allocator:

- incorrect assertions in SplitAt;
- allocation finger should not cache positions that are owned by a sibling after split;
- UpdateFreeUntil should allow evicting live range with vreg 0;
- values expected in fixed locations should not cause an interference at the instruction itself, they can be evicted if need arises;

Bug fixed in deoptimization:

- parallel move resolver uses push/pop to free a scratch register for memory to memory moves, when using it for deoptimization we need to ensure that those push/pops do not interfere with actual moves;  

R=srdjan@google.com
BUG=

Committed: https://code.google.com/p/dart/source/detail?r=10287

[srdjan, 2012-08-03 16:56:56]

lgtm