MIPS: Fix trampoline emission after switch table generation

src/mips64/assembler-mips64.h

Index: src/mips64/assembler-mips64.h
diff --git a/src/mips64/assembler-mips64.h b/src/mips64/assembler-mips64.h
index a57722303d964d95f3c2323a37ea2539e379054e..caf3ecfc9302c87129f8bd799a6fd38f4013799e 100644
--- a/src/mips64/assembler-mips64.h
+++ b/src/mips64/assembler-mips64.h
@@ -1503,6 +1503,10 @@ class Assembler : public AssemblerBase {
   // Internal reference positions, required for unbounded internal reference
   // labels.
   std::set<int64_t> 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; }