Pacify -Wnon-virtual-dtor.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166270 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/MC/MCParser/MCAsmParser.h b/include/llvm/MC/MCParser/MCAsmParser.h
index 554cdfa..fcf5b6a 100644
--- a/include/llvm/MC/MCParser/MCAsmParser.h
+++ b/include/llvm/MC/MCParser/MCAsmParser.h
@@ -34,6 +34,7 @@
 /// MCAsmParserSemaCallback - Generic Sema callback for assembly parser.
 class MCAsmParserSemaCallback {
 public:
+  virtual ~MCAsmParserSemaCallback(); 
   virtual void *LookupInlineAsmIdentifier(StringRef Name, void *Loc,
                                           unsigned &Size) = 0;
 };
diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index 6259c15..1573799 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -46,6 +46,8 @@
 FatalAssemblerWarnings("fatal-assembler-warnings",
                        cl::desc("Consider warnings as error"));
 
+MCAsmParserSemaCallback::~MCAsmParserSemaCallback() {} 
+
 namespace {
 
 /// \brief Helper class for tracking macro definitions.