Remove HNativeDebugInfo from start of basic blocks.

We do not require full environment at the start of basic block.
The dex pc contained in basic block is sufficient for line mapping.

Change-Id: I5ba9e5f5acbc4a783ad544769f9a73bb33e2bafa
diff --git a/compiler/optimizing/code_generator_mips64.h b/compiler/optimizing/code_generator_mips64.h
index 1161253..1ba44df 100644
--- a/compiler/optimizing/code_generator_mips64.h
+++ b/compiler/optimizing/code_generator_mips64.h
@@ -352,6 +352,8 @@
     UNIMPLEMENTED(FATAL);
   }
 
+  void GenerateNop();
+
  private:
   // Labels for each block that will be compiled.
   Mips64Label* block_labels_;  // Indexed by block id.