tidy up forward declarations.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149078 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 16e9137..bdb462e 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -31,6 +31,8 @@
 namespace llvm {
 
 class CompileUnit;
+class ConstantInt;
+class ConstantFP;
 class DbgVariable;
 class MachineFrameInfo;
 class MachineModuleInfo;