Support unboxed input to indirect goto instruction.

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 d8a6a4f2a8842e0d2bc1739a916913f1381069e4..9f59aa49cbbfee97f4b9de98e93108f55b615c29 100644
--- a/runtime/vm/intermediate_language_arm64.cc
+++ b/runtime/vm/intermediate_language_arm64.cc
@@ -5462,9 +5462,11 @@ void IndirectGotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 
   // Add the offset.
   Register offset_reg = locs()->in(0).reg();
-  __ add(target_address_reg,
-         target_address_reg,
-         Operand(offset_reg, ASR, kSmiTagSize));
+  Operand offset_opr =
+      offset()->definition()->representation() == kTagged ?
+      Operand(offset_reg, ASR, kSmiTagSize) :
+      Operand(offset_reg);
+  __ add(target_address_reg, target_address_reg, offset_opr);
 
   // Jump to the absolute address.
   __ br(target_address_reg);