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/OptionGroupOutputFile.cpp b/lldb/source/Interpreter/OptionGroupOutputFile.cpp
index 9c8eb94..93c0ffb 100644
--- a/lldb/source/Interpreter/OptionGroupOutputFile.cpp
+++ b/lldb/source/Interpreter/OptionGroupOutputFile.cpp
@@ -38,7 +38,7 @@
 uint32_t
 OptionGroupOutputFile::GetNumDefinitions ()
 {
-    return arraysize(g_option_table);
+    return llvm::array_lengthof(g_option_table);
 }
 
 const OptionDefinition *