Commit of forgotten header for r280339 "[LLVM/Support] - Create no-arguments constructor for llvm::Regex"

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280340 91177308-0d34-0410-b5e6-96231b3b80d8

Author: George Rimar

include/llvm/Support/Regex.h

@@ -43,6 +43,7 @@ namespace llvm {
       BasicRegex=4
     };
 
+    Regex();
     /// Compiles the given regular expression \p Regex.
     Regex(StringRef Regex, unsigned Flags = NoFlags);
     Regex(const Regex &) = delete;