DebugInfo: Gut DISubprogram and DILexicalBlock*

Gut the `DIDescriptor` wrappers around `MDLocalScope` subclasses.  Note
that `DILexicalBlock` wraps `MDLexicalBlockBase`, not `MDLexicalBlock`.

llvm-svn: 234850
diff --git a/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp b/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
index 2bd311b..d859ee1 100644
--- a/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
@@ -192,7 +192,7 @@
   StringRef GVName = GV->getName();
   StringRef FuncName;
   if (DISubprogram SP = getDISubprogram(GV))
-    FuncName = SP.getDisplayName();
+    FuncName = SP->getDisplayName();
 
   // FIXME Clang currently sets DisplayName to "bar" for a C++
   // "namespace_foo::bar" function, see PR21528.  Luckily, dbghelp.dll is trying