Quick: PC-relative loads from dex cache arrays on x86.

Rewrite all PC-relative addressing on x86 and implement
PC-relative loads from dex cache arrays. Don't adjust the
base to point to the start of the method, let it point to
the anchor, i.e. the target of the "call +0" insn.

Change-Id: Ic22544a8bc0c5e49eb00a75154dc8f3ead816989