Consistently use k{InstructionSet}WordSize.

These constants were defined prior to k{InstructionSet}PointerSize. So
use them consistently in optimizing as a first step. We can discuss
whether we should remove them in a second step.

Change-Id: If129de1a3bb8b65f8d9c816a8ad466815fb202e6
diff --git a/compiler/optimizing/code_generator_x86.cc b/compiler/optimizing/code_generator_x86.cc
index b0f36ce..3c53cea 100644
--- a/compiler/optimizing/code_generator_x86.cc
+++ b/compiler/optimizing/code_generator_x86.cc
@@ -1120,7 +1120,8 @@
   // temp = temp[index_in_cache]
   __ movl(temp, Address(temp, CodeGenerator::GetCacheOffset(invoke->GetIndexInDexCache())));
   // (temp + offset_of_quick_compiled_code)()
-  __ call(Address(temp, mirror::ArtMethod::EntryPointFromQuickCompiledCodeOffset(4).Int32Value()));
+  __ call(Address(
+      temp, mirror::ArtMethod::EntryPointFromQuickCompiledCodeOffset(kX86WordSize).Int32Value()));
 
   DCHECK(!codegen_->IsLeafMethod());
   codegen_->RecordPcInfo(invoke, invoke->GetDexPc());
@@ -1184,7 +1185,8 @@
   // temp = temp->GetMethodAt(method_offset);
   __ movl(temp, Address(temp, method_offset));
   // call temp->GetEntryPoint();
-  __ call(Address(temp, mirror::ArtMethod::EntryPointFromQuickCompiledCodeOffset(4).Int32Value()));
+  __ call(Address(
+      temp, mirror::ArtMethod::EntryPointFromQuickCompiledCodeOffset(kX86WordSize).Int32Value()));
 
   DCHECK(!codegen_->IsLeafMethod());
   codegen_->RecordPcInfo(invoke, invoke->GetDexPc());
@@ -1220,7 +1222,7 @@
   __ movl(temp, Address(temp, method_offset));
   // call temp->GetEntryPoint();
   __ call(Address(temp, mirror::ArtMethod::EntryPointFromQuickCompiledCodeOffset(
-      kX86PointerSize).Int32Value()));
+      kX86WordSize).Int32Value()));
 
   DCHECK(!codegen_->IsLeafMethod());
   codegen_->RecordPcInfo(invoke, invoke->GetDexPc());