Superfluous dyn_cast in DISubprogram::getFunction()

[Yaron Keren]

This dyn_cast does not seem to be required.

Yaron
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Index: lib/IR/DebugInfo.cpp
===================================================================
--- lib/IR/DebugInfo.cpp	(revision 234493)
+++ lib/IR/DebugInfo.cpp	(working copy)
@@ -110,7 +110,7 @@
 
 Function *DISubprogram::getFunction() const {
   if (auto *N = get())
-    if (auto *C = dyn_cast_or_null<ConstantAsMetadata>(N->getFunction()))
+    if (auto *C = N->getFunction())
       return dyn_cast<Function>(C->getValue());
   return nullptr;
 }