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
diff --git a/compiler/dex/quick/codegen_util.cc b/compiler/dex/quick/codegen_util.cc
index 232a228..f8594a2 100644
--- a/compiler/dex/quick/codegen_util.cc
+++ b/compiler/dex/quick/codegen_util.cc
@@ -541,13 +541,11 @@
         DCHECK(tab_rec->anchor->flags.fixup != kFixupNone);
         bx_offset = tab_rec->anchor->offset + 4;
         break;
-      case kX86:
-        bx_offset = 0;
-        break;
       case kX86_64:
         // RIP relative to switch table.
         bx_offset = tab_rec->offset;
         break;
+      case kX86:
       case kArm64:
       case kMips:
       case kMips64: