Remove some more embedded pointers.

runtime/vm/intermediate_language_arm64.cc

Index: runtime/vm/intermediate_language_arm64.cc
diff --git a/runtime/vm/intermediate_language_arm64.cc b/runtime/vm/intermediate_language_arm64.cc
index 7ae62c03ef4991e398c4dca35528622f2d16feb9..75ff6acd69c2d3cf2bad9d0aecc2d05f75dd2e47 100644
--- a/runtime/vm/intermediate_language_arm64.cc
+++ b/runtime/vm/intermediate_language_arm64.cc
@@ -945,14 +945,8 @@ LocationSummary* LoadClassIdInstr::MakeLocationSummary(Zone* zone,
 void LoadClassIdInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register object = locs()->in(0).reg();
   const Register result = locs()->out(0).reg();
-  static const intptr_t kSmiCidSource =
-      static_cast<intptr_t>(kSmiCid) << RawObject::kClassIdTagPos;
 
-  __ LoadImmediate(TMP, reinterpret_cast<int64_t>(&kSmiCidSource) + 1);
-  __ tsti(object, Immediate(kSmiTagMask));
-  __ csel(TMP, TMP, object, EQ);
-  __ LoadClassId(result, TMP);
-  __ SmiTag(result);
+  __ LoadTaggedClassIdMayBeSmi(result, object);
 }