Implement various missing parts of the X86 compiler

Change-Id: I76f08580600befe268328f8cf7102c6146460c5e
diff --git a/src/compiler/codegen/CodegenUtil.cc b/src/compiler/codegen/CodegenUtil.cc
index 20eb47f..00e78ec 100644
--- a/src/compiler/codegen/CodegenUtil.cc
+++ b/src/compiler/codegen/CodegenUtil.cc
@@ -657,6 +657,8 @@
          */
 #if defined(TARGET_ARM)
         int bxOffset = tabRec->anchor->offset + 4;
+#elif defined(TARGET_X86)
+        int bxOffset = 0;
 #else
         int bxOffset = tabRec->anchor->offset;
 #endif