MIPS64: Fix BlockTrampolinePoolFor() to emit trampoline before blocking, if needed.

test/cctest/test-assembler-mips64.cc

Index: test/cctest/test-assembler-mips64.cc
diff --git a/test/cctest/test-assembler-mips64.cc b/test/cctest/test-assembler-mips64.cc
index c4db5b52c14222738919385fc8a51056ab9a4ca6..bb7b05ca768c09b897b04ce0e881e7c9f6416a5f 100644
--- a/test/cctest/test-assembler-mips64.cc
+++ b/test/cctest/test-assembler-mips64.cc
@@ -3082,6 +3082,7 @@ TEST(jump_tables1) {
 
   Label done;
   {
+    __ BlockTrampolinePoolFor(kNumCases * 2 + 7);
     PredictableCodeSizeScope predictable(
         &assm, (kNumCases * 2 + 7) * Assembler::kInstrSize);
     Label here;
@@ -3162,6 +3163,7 @@ TEST(jump_tables2) {
   }
   __ bind(&dispatch);
   {
+    __ BlockTrampolinePoolFor(kNumCases * 2 + 7);
     PredictableCodeSizeScope predictable(
         &assm, (kNumCases * 2 + 7) * Assembler::kInstrSize);
     Label here;
@@ -3244,6 +3246,7 @@ TEST(jump_tables3) {
   }
   __ bind(&dispatch);
   {
+    __ BlockTrampolinePoolFor(kNumCases * 2 + 7);
     PredictableCodeSizeScope predictable(
         &assm, (kNumCases * 2 + 7) * Assembler::kInstrSize);
     Label here;