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_arm64.cc b/disassembler/disassembler_arm64.cc
index a93f7d5..0ef9025 100644
--- a/disassembler/disassembler_arm64.cc
+++ b/disassembler/disassembler_arm64.cc
@@ -102,7 +102,7 @@
   if (instr->GetRn() == TR) {
     int64_t offset = instr->GetImmLSUnsigned() << instr->GetSizeLS();
     std::ostringstream tmp_stream;
-    Thread::DumpThreadOffset<8>(tmp_stream, static_cast<uint32_t>(offset));
+    Thread::DumpThreadOffset<kArm64PointerSize>(tmp_stream, static_cast<uint32_t>(offset));
     AppendToOutput(" ; %s", tmp_stream.str().c_str());
   }
 }