VM: Re-format to use at most one newline between functions

runtime/vm/instructions_dbc.h

Index: runtime/vm/instructions_dbc.h
diff --git a/runtime/vm/instructions_dbc.h b/runtime/vm/instructions_dbc.h
index e0ea7999033b0010c67593546f3dac48faad8fb2..301c14b25b9c937d9400bb04485e1b7e5b4098d8 100644
--- a/runtime/vm/instructions_dbc.h
+++ b/runtime/vm/instructions_dbc.h
@@ -47,7 +47,6 @@ class InstructionPattern : public AllStatic {
                                       intptr_t* index);
 };
 
-
 class CallPattern : public ValueObject {
  public:
   CallPattern(uword pc, const Code& code);
@@ -71,7 +70,6 @@ class CallPattern : public ValueObject {
   DISALLOW_COPY_AND_ASSIGN(CallPattern);
 };
 
-
 class NativeCallPattern : public ValueObject {
  public:
   NativeCallPattern(uword pc, const Code& code);
@@ -92,7 +90,6 @@ class NativeCallPattern : public ValueObject {
   DISALLOW_COPY_AND_ASSIGN(NativeCallPattern);
 };
 
-
 // Instance call that can switch between a direct monomorphic call, an IC call,
 // and a megamorphic call.
 //   load guarded cid            load ICData             load MegamorphicCache
@@ -115,7 +112,6 @@ class SwitchableCallPattern : public ValueObject {
   DISALLOW_COPY_AND_ASSIGN(SwitchableCallPattern);
 };
 
-
 class ReturnPattern : public ValueObject {
  public:
   explicit ReturnPattern(uword pc);