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_64.cc b/compiler/optimizing/code_generator_x86_64.cc
index e9c67e3..97f5e5c 100644
--- a/compiler/optimizing/code_generator_x86_64.cc
+++ b/compiler/optimizing/code_generator_x86_64.cc
@@ -1113,7 +1113,7 @@
   __ movl(temp, Address(temp, CodeGenerator::GetCacheOffset(invoke->GetIndexInDexCache())));
   // (temp + offset_of_quick_compiled_code)()
   __ call(Address(temp, mirror::ArtMethod::EntryPointFromQuickCompiledCodeOffset(
-      kX86_64PointerSize).SizeValue()));
+      kX86_64WordSize).SizeValue()));
 
   DCHECK(!codegen_->IsLeafMethod());
   codegen_->RecordPcInfo(invoke, invoke->GetDexPc());
@@ -1173,7 +1173,7 @@
   __ movl(temp, Address(temp, method_offset));
   // call temp->GetEntryPoint();
   __ call(Address(temp, mirror::ArtMethod::EntryPointFromQuickCompiledCodeOffset(
-      kX86_64PointerSize).SizeValue()));
+      kX86_64WordSize).SizeValue()));
 
   DCHECK(!codegen_->IsLeafMethod());
   codegen_->RecordPcInfo(invoke, invoke->GetDexPc());
@@ -1209,7 +1209,7 @@
   __ movl(temp, Address(temp, method_offset));
   // call temp->GetEntryPoint();
   __ call(Address(temp, mirror::ArtMethod::EntryPointFromQuickCompiledCodeOffset(
-      kX86_64PointerSize).SizeValue()));
+      kX86_64WordSize).SizeValue()));
 
   DCHECK(!codegen_->IsLeafMethod());
   codegen_->RecordPcInfo(invoke, invoke->GetDexPc());