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/disassembler/disassembler_x86.cc b/disassembler/disassembler_x86.cc
index 7f6a7ba..5c239f7 100644
--- a/disassembler/disassembler_x86.cc
+++ b/disassembler/disassembler_x86.cc
@@ -1409,11 +1409,11 @@
   }
   if (prefix[1] == kFs && !supports_rex_) {
     args << "  ; ";
-    Thread::DumpThreadOffset<4>(args, address_bits);
+    Thread::DumpThreadOffset<kX86PointerSize>(args, address_bits);
   }
   if (prefix[1] == kGs && supports_rex_) {
     args << "  ; ";
-    Thread::DumpThreadOffset<8>(args, address_bits);
+    Thread::DumpThreadOffset<kX86_64PointerSize>(args, address_bits);
   }
   const char* prefix_str;
   switch (prefix[0]) {