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

runtime/vm/flow_graph_builder.h

Index: runtime/vm/flow_graph_builder.h
diff --git a/runtime/vm/flow_graph_builder.h b/runtime/vm/flow_graph_builder.h
index b4018dfdc8a4b937b6759363d053140a7795de4d..f195a4e3b06f943d2316ebd1b3abd2e7a1162115 100644
--- a/runtime/vm/flow_graph_builder.h
+++ b/runtime/vm/flow_graph_builder.h
@@ -90,7 +90,6 @@ class InlineExitCollector : public ZoneAllocated {
   GrowableArray<Data> exits_;
 };
 
-
 // Build a flow graph from a parsed function's AST.
 class FlowGraphBuilder : public ValueObject {
  public:
@@ -230,7 +229,6 @@ class FlowGraphBuilder : public ValueObject {
   DISALLOW_IMPLICIT_CONSTRUCTORS(FlowGraphBuilder);
 };
 
-
 // Translate an AstNode to a control-flow graph fragment for its effects
 // (e.g., a statement or an expression in an effect context).  Implements a
 // function from an AstNode and next temporary index to a graph fragment
@@ -468,7 +466,6 @@ class EffectGraphVisitor : public AstNodeVisitor {
   Instruction* exit_;
 };
 
-
 // Translate an AstNode to a control-flow graph fragment for both its effects
 // and value (e.g., for an expression in a value context).  Implements a
 // function from an AstNode and next temporary index to a graph fragment (as
@@ -514,7 +511,6 @@ class ValueGraphVisitor : public EffectGraphVisitor {
   }
 };
 
-
 // Translate an AstNode to a control-flow graph fragment for both its
 // effects and true/false control flow (e.g., for an expression in a test
 // context).  The resulting graph is always closed (even if it is empty)