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

runtime/vm/allocation.h

Index: runtime/vm/allocation.h
diff --git a/runtime/vm/allocation.h b/runtime/vm/allocation.h
index baa99f1d524ebf40867d510a877e5e3aba330a16..3442acf98187c4bccffbe6fa4e8e12dbb0adfae9 100644
--- a/runtime/vm/allocation.h
+++ b/runtime/vm/allocation.h
@@ -50,7 +50,6 @@ class StackResource {
   DISALLOW_IMPLICIT_CONSTRUCTORS(StackResource);
 };
 
-
 // Zone allocated objects cannot be individually deallocated, but have
 // to rely on the destructor of Zone which is called when the Zone
 // goes out of scope to reclaim memory.
@@ -78,7 +77,6 @@ class ZoneAllocated {
   DISALLOW_COPY_AND_ASSIGN(ZoneAllocated);
 };
 
-
 // Within a NoSafepointScope, the thread must not reach any safepoint. Used
 // around code that manipulates raw object pointers directly without handles.
 #if defined(DEBUG)