Keep two empty lines between declarations for cpp files

src/mips/codegen-mips.cc

Index: src/mips/codegen-mips.cc
===================================================================
--- src/mips/codegen-mips.cc	(revision 15486)
+++ src/mips/codegen-mips.cc	(working copy)
@@ -120,6 +120,7 @@
   return &sqrt;
 }
 
+
 // -------------------------------------------------------------------------
 // Platform-specific RuntimeCallHelper functions.
 
@@ -136,6 +137,7 @@
   masm->set_has_frame(false);
 }
 
+
 // -------------------------------------------------------------------------
 // Code generators