Revert r218925 - "Patch to warn if 'override' is missing"

This CL has caused bootstrap failures on Linux and OSX buildbots running with -Werror.

Example report from http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux/builds/13183/steps/bootstrap%20clang/logs/stdio:

================================================================
[ 91%] Building CXX object tools/clang/tools/diagtool/CMakeFiles/diagtool.dir/ShowEnabledWarnings.cpp.o
In file included from /home/dtoolsbot/build/sanitizer-x86_64-linux/build/llvm/lib/Target/R600/AMDGPUISelDAGToDAG.cpp:20:
In file included from /home/dtoolsbot/build/sanitizer-x86_64-linux/build/llvm/lib/Target/R600/SIISelLowering.h:19:
/home/dtoolsbot/build/sanitizer-x86_64-linux/build/llvm/lib/Target/R600/SIInstrInfo.h:71:8: error: 'getLdStBaseRegImmOfs' overrides a member function but is not marked 'override' [-Werror,-Winconsistent-missing-override]
  bool getLdStBaseRegImmOfs(MachineInstr *LdSt,
       ^
/home/dtoolsbot/build/sanitizer-x86_64-linux/build/llvm/include/llvm/Target/TargetInstrInfo.h:815:16: note: overridden virtual function is here
  virtual bool getLdStBaseRegImmOfs(MachineInstr *LdSt,
               ^
================================================================

llvm-svn: 218969
diff --git a/clang/test/Parser/cxx0x-decl.cpp b/clang/test/Parser/cxx0x-decl.cpp
index 9bc60bd..2cd6825 100644
--- a/clang/test/Parser/cxx0x-decl.cpp
+++ b/clang/test/Parser/cxx0x-decl.cpp
@@ -83,13 +83,13 @@
 
 namespace FinalOverride {
   struct Base {
-    virtual void *f(); // expected-note {{overridden virtual function is here}}
+    virtual void *f();
     virtual void *g();
     virtual void *h();
     virtual void *i();
   };
   struct Derived : Base {
-    virtual auto f() -> void *final; // expected-warning {{'f' overrides a member function but is not marked 'override'}}
+    virtual auto f() -> void *final;
     virtual auto g() -> void *override;
     virtual auto h() -> void *final override;
     virtual auto i() -> void *override final;