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

runtime/vm/instructions_arm64.h

Index: runtime/vm/instructions_arm64.h
diff --git a/runtime/vm/instructions_arm64.h b/runtime/vm/instructions_arm64.h
index 01808fc4c6c491cbae4c1807909ea9885db97f5e..f352e8867ea35703916094c20be348a40b0c9fa5 100644
--- a/runtime/vm/instructions_arm64.h
+++ b/runtime/vm/instructions_arm64.h
@@ -54,7 +54,6 @@ class InstructionPattern : public AllStatic {
   static intptr_t OffsetFromPPIndex(intptr_t index);
 };
 
-
 class CallPattern : public ValueObject {
  public:
   CallPattern(uword pc, const Code& code);
@@ -76,7 +75,6 @@ class CallPattern : public ValueObject {
   DISALLOW_COPY_AND_ASSIGN(CallPattern);
 };
 
-
 class NativeCallPattern : public ValueObject {
  public:
   NativeCallPattern(uword pc, const Code& code);
@@ -97,7 +95,6 @@ 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
@@ -120,7 +117,6 @@ class SwitchableCallPattern : public ValueObject {
   DISALLOW_COPY_AND_ASSIGN(SwitchableCallPattern);
 };
 
-
 class ReturnPattern : public ValueObject {
  public:
   explicit ReturnPattern(uword pc);