[C++11] Remove 'virtual' keyword from methods marked with 'override' keyword.

llvm-svn: 203442
diff --git a/llvm/lib/Support/MemoryBuffer.cpp b/llvm/lib/Support/MemoryBuffer.cpp
index c7f76d3..2d593a8 100644
--- a/llvm/lib/Support/MemoryBuffer.cpp
+++ b/llvm/lib/Support/MemoryBuffer.cpp
@@ -91,12 +91,12 @@
     init(InputData.begin(), InputData.end(), RequiresNullTerminator);
   }
 
-  virtual const char *getBufferIdentifier() const override {
+  const char *getBufferIdentifier() const override {
      // The name is stored after the class itself.
     return reinterpret_cast<const char*>(this + 1);
   }
 
-  virtual BufferKind getBufferKind() const override {
+  BufferKind getBufferKind() const override {
     return MemoryBuffer_Malloc;
   }
 };
@@ -217,12 +217,12 @@
     }
   }
 
-  virtual const char *getBufferIdentifier() const override {
+  const char *getBufferIdentifier() const override {
     // The name is stored after the class itself.
     return reinterpret_cast<const char *>(this + 1);
   }
 
-  virtual BufferKind getBufferKind() const override {
+  BufferKind getBufferKind() const override {
     return MemoryBuffer_MMap;
   }
 };