Change the inlining context from an enum to a class.

runtime/vm/compiler.cc

Index: runtime/vm/compiler.cc
diff --git a/runtime/vm/compiler.cc b/runtime/vm/compiler.cc
index f2b04e61db27552dc74abfb75d43c1ab3df7ea7d..406802556d4ad3826947b4c71bf670efdf8b7d37 100644
--- a/runtime/vm/compiler.cc
+++ b/runtime/vm/compiler.cc
@@ -149,9 +149,8 @@ static bool CompileParsedFunctionHelper(const ParsedFunction& parsed_function,
       }
 
       // Build the flow graph.
-      FlowGraphBuilder builder(parsed_function);
-      flow_graph = builder.BuildGraph(FlowGraphBuilder::kNotInlining,
-                                      0);  // The initial loop depth is zero.
+      FlowGraphBuilder builder(parsed_function, NULL);  // NULL = not inlining.
+      flow_graph = builder.BuildGraph(0);  // The initial loop depth is zero.
     }
 
     if (optimized) {