MIPS: Fix trampoline emission after switch table generation

src/mips/assembler-mips.h

Index: src/mips/assembler-mips.h
diff --git a/src/mips/assembler-mips.h b/src/mips/assembler-mips.h
index 965c0cdc2916ce7e870b757d4259ce6d83997be4..1b93829682371ea5b746e37c064ca71ea7407100 100644
--- a/src/mips/assembler-mips.h
+++ b/src/mips/assembler-mips.h
@@ -1452,6 +1452,10 @@ class Assembler : public AssemblerBase {
   // Internal reference positions, required for unbounded internal reference
   // labels.
   std::set<int> internal_reference_positions_;
+  bool is_internal_reference(Label* L) {
+    return internal_reference_positions_.find(L->pos()) !=
+           internal_reference_positions_.end();
+  }
 
   void EmittedCompactBranchInstruction() { prev_instr_compact_branch_ = true; }
   void ClearCompactBranchState() { prev_instr_compact_branch_ = false; }