ARM64: Restructure the L1 deopt jump table.

ARM64: Restructure the L1 deopt jump table.

This restructures the L1 deopt jump table so that the base address of
the L2 table is only loaded once. This significantly reduces the size of
the generated code because only one big immediate needs to be loaded.

The total size of all L1 deopt tables generated during Octane is almost
halved in size, from about 1105kB to 584kB.

BUG=
R=ulan@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=21608

[ulan, 2014-06-02 13:10:24]

lgtm

[jbramley, 2014-06-02 13:12:23]

Committed patchset #1 manually as r21608 (presubmit successful).