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

R=asiva@google.com

Review-Url: https://codereview.chromium.org/2974233002 .

runtime/vm/code_patcher.h

@@ -24,7 +24,6 @@ class RawICData;
 class RawObject;
 class String;
 
-
 // Stack-allocated class to create a scope where the specified region
 // [address, address + size] has write access enabled. This is used
 // when patching generated code. Access is reset to read-execute in
@@ -39,7 +38,6 @@ class WritableInstructionsScope : public ValueObject {
   const intptr_t size_;
 };
 
-
 class CodePatcher : public AllStatic {
  public:
   // Dart static calls have a distinct, machine-dependent code pattern.