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/arch/x86/thread_x86.cc b/runtime/arch/x86/thread_x86.cc
index c39d122..241650e 100644
--- a/runtime/arch/x86/thread_x86.cc
+++ b/runtime/arch/x86/thread_x86.cc
@@ -20,6 +20,7 @@
 #include <sys/types.h>
 
 #include "asm_support_x86.h"
+#include "base/enums.h"
 #include "base/macros.h"
 #include "thread-inl.h"
 #include "thread_list.h"
@@ -136,7 +137,7 @@
 
   // Sanity check that reads from %fs point to this Thread*.
   Thread* self_check;
-  CHECK_EQ(THREAD_SELF_OFFSET, SelfOffset<4>().Int32Value());
+  CHECK_EQ(THREAD_SELF_OFFSET, SelfOffset<PointerSize::k32>().Int32Value());
   __asm__ __volatile__("movl %%fs:(%1), %0"
       : "=r"(self_check)  // output
       : "r"(THREAD_SELF_OFFSET)  // input
@@ -144,9 +145,9 @@
   CHECK_EQ(self_check, this);
 
   // Sanity check other offsets.
-  CHECK_EQ(THREAD_EXCEPTION_OFFSET, ExceptionOffset<4>().Int32Value());
-  CHECK_EQ(THREAD_CARD_TABLE_OFFSET, CardTableOffset<4>().Int32Value());
-  CHECK_EQ(THREAD_ID_OFFSET, ThinLockIdOffset<4>().Int32Value());
+  CHECK_EQ(THREAD_EXCEPTION_OFFSET, ExceptionOffset<PointerSize::k32>().Int32Value());
+  CHECK_EQ(THREAD_CARD_TABLE_OFFSET, CardTableOffset<PointerSize::k32>().Int32Value());
+  CHECK_EQ(THREAD_ID_OFFSET, ThinLockIdOffset<PointerSize::k32>().Int32Value());
 }
 
 void Thread::CleanupCpu() {