ART: Convert pointer size to enum

Move away from size_t to dedicated enum (class).

Bug: 30373134
Bug: 30419309
Test: m test-art-host
Change-Id: Id453c330f1065012e7d4f9fc24ac477cc9bb9269
diff --git a/runtime/interpreter/unstarted_runtime_test.cc b/runtime/interpreter/unstarted_runtime_test.cc
index 814b001..7e1f795 100644
--- a/runtime/interpreter/unstarted_runtime_test.cc
+++ b/runtime/interpreter/unstarted_runtime_test.cc
@@ -20,6 +20,7 @@
 #include <locale>
 
 #include "base/casts.h"
+#include "base/enums.h"
 #include "base/memory_tool.h"
 #include "class_linker.h"
 #include "common_runtime_test.h"
@@ -383,7 +384,7 @@
   ScopedObjectAccess soa(self);
   mirror::Class* klass = mirror::String::GetJavaLangString();
   ArtMethod* method = klass->FindDeclaredDirectMethod("<init>", "(Ljava/lang/String;)V",
-                                                      sizeof(void*));
+                                                      kRuntimePointerSize);
 
   // create instruction data for invoke-direct {v0, v1} of method with fake index
   uint16_t inst_data[3] = { 0x2070, 0x0000, 0x0010 };