isSubroutineType does not test for isCompositeType

[Yaron Keren]

The test for isCompositeType() seems to have no purpose, as getTag() is
tested for specific value anyhow.
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Index: lib/IR/DebugInfo.cpp
===================================================================
--- lib/IR/DebugInfo.cpp	(revision 224196)
+++ lib/IR/DebugInfo.cpp	(working copy)
@@ -166,7 +166,7 @@
 //===----------------------------------------------------------------------===//
 
 bool DIDescriptor::isSubroutineType() const {
-  return isCompositeType() && getTag() == dwarf::DW_TAG_subroutine_type;
+  return DbgNode && getTag() == dwarf::DW_TAG_subroutine_type;
 }
 
 bool DIDescriptor::isBasicType() const {