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

src/mips/assembler-mips-inl.h

Index: src/mips/assembler-mips-inl.h
diff --git a/src/mips/assembler-mips-inl.h b/src/mips/assembler-mips-inl.h
index afca7d00a6c113fcf65f6dac011cf5eef8633f7d..bb422a3fcd900bc726c0e01413cb9cd2f93b537c 100644
--- a/src/mips/assembler-mips-inl.h
+++ b/src/mips/assembler-mips-inl.h
@@ -500,8 +500,8 @@ void Assembler::CheckBuffer() {
 }
 
 
-void Assembler::CheckTrampolinePoolQuick() {
-  if (pc_offset() >= next_buffer_check_) {
+void Assembler::CheckTrampolinePoolQuick(int extra_instructions) {
+  if (pc_offset() >= next_buffer_check_ - extra_instructions * kInstrSize) {
     CheckTrampolinePool();
   }
 }