Update V8 to r6101 as required by WebKit r74534

Change-Id: I7f84af8dd732f11898fd644b2c2b1538914cb78d
diff --git a/src/handles.h b/src/handles.h
index 2e18ab3..8fd25dc 100644
--- a/src/handles.h
+++ b/src/handles.h
@@ -342,6 +342,8 @@
 
 bool CompileLazyInLoop(Handle<JSFunction> function, ClearExceptionFlag flag);
 
+bool CompileOptimized(Handle<JSFunction> function, int osr_ast_id);
+
 class NoHandleAllocation BASE_EMBEDDED {
  public:
 #ifndef DEBUG