Support unboxed input to indirect goto instruction.

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
diff --git a/runtime/vm/intermediate_language_mips.cc b/runtime/vm/intermediate_language_mips.cc
index eb16efdacad24d9230117b5bbea551915297054b..5f794137fff233d07d196c62ee0e7f95cde5e06a 100644
--- a/runtime/vm/intermediate_language_mips.cc
+++ b/runtime/vm/intermediate_language_mips.cc
@@ -5439,7 +5439,9 @@ void IndirectGotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 
   // Add the offset.
   Register offset_reg = locs()->in(0).reg();
+  if (offset()->definition()->representation() == kTagged) {
   __ SmiUntag(offset_reg);
+  }
   __ addu(target_address_reg, target_address_reg, offset_reg);
 
   // Jump to the absolute address.