Include llvm/ADT/STLExtras.h from lldb/Utility/Utils.h and use llvm::array_lengthof(), instead.

llvm-svn: 156876
diff --git a/lldb/source/Interpreter/OptionGroupValueObjectDisplay.cpp b/lldb/source/Interpreter/OptionGroupValueObjectDisplay.cpp
index 7626310..28c31ce 100644
--- a/lldb/source/Interpreter/OptionGroupValueObjectDisplay.cpp
+++ b/lldb/source/Interpreter/OptionGroupValueObjectDisplay.cpp
@@ -49,7 +49,7 @@
 uint32_t
 OptionGroupValueObjectDisplay::GetNumDefinitions ()
 {
-    return arraysize(g_option_table);
+    return llvm::array_lengthof(g_option_table);
 }
 
 const OptionDefinition *