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/tools/cpp-define-generator/offset_thread.def b/tools/cpp-define-generator/offset_thread.def
index 71648e6..6f94d38 100644
--- a/tools/cpp-define-generator/offset_thread.def
+++ b/tools/cpp-define-generator/offset_thread.def
@@ -17,13 +17,14 @@
 // Offsets within ShadowFrame.
 
 #if defined(DEFINE_INCLUDE_DEPENDENCIES)
+#include "base/enums.h"    // PointerSize
 #include "stack.h"         // art::ShadowFrame
 #endif
 
 #include "common.def"        // DEFINE_OFFSET_EXPR
 
 #define DEFINE_THREAD_OFFSET(field_name, method_name) \
-  DEFINE_OFFSET_EXPR(Thread, field_name, int32_t, art::Thread::method_name##Offset<sizeof(void*)>().Int32Value())
+  DEFINE_OFFSET_EXPR(Thread, field_name, int32_t, art::Thread::method_name##Offset<art::kRuntimePointerSize>().Int32Value())
 
 //                   New macro suffix            Method Name (of the Offset method)
 DEFINE_THREAD_OFFSET(FLAGS,                      ThreadFlags)