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

src/mips64/assembler-mips64-inl.h

Index: src/mips64/assembler-mips64-inl.h
diff --git a/src/mips64/assembler-mips64-inl.h b/src/mips64/assembler-mips64-inl.h
index 40c7640f2f8272b99c2ae826605098dc3117314b..bfeb3002eb631e169302d7575d62c3b5432120ad 100644
--- a/src/mips64/assembler-mips64-inl.h
+++ b/src/mips64/assembler-mips64-inl.h
@@ -493,8 +493,8 @@ 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();
   }
 }