Introduce -fsanitize-stats flag.

This is part of a new statistics gathering feature for the sanitizers.
See clang/docs/SanitizerStats.rst for further info and docs.

Differential Revision: http://reviews.llvm.org/D16175

llvm-svn: 257971
diff --git a/clang/lib/CodeGen/CodeGenFunction.h b/clang/lib/CodeGen/CodeGenFunction.h
index b3d5035..3dc0f35 100644
--- a/clang/lib/CodeGen/CodeGenFunction.h
+++ b/clang/lib/CodeGen/CodeGenFunction.h
@@ -36,6 +36,7 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/IR/ValueHandle.h"
 #include "llvm/Support/Debug.h"
+#include "llvm/Transforms/Utils/SanitizerStats.h"
 
 namespace llvm {
 class BasicBlock;
@@ -3187,6 +3188,8 @@
   Address EmitPointerWithAlignment(const Expr *Addr,
                                    AlignmentSource *Source = nullptr);
 
+  void EmitSanitizerStatReport(llvm::SanitizerStatKind SSK);
+
 private:
   QualType getVarArgType(const Expr *Arg);