Add get and getError methods to ErrorOr.

ErrorOr is modeled after boost::optional which has a get method.

llvm-svn: 198792

llvm/include/llvm/Support/ErrorOr.h

@@ -178,10 +178,17 @@ public:
     return HasError ? 0 : unspecified_bool_true;
   }
 
+  T &get() { return *getStorage(); }
+  const T &get() const { return const_cast<ErrorOr<T> >(this)->get(); }
+
   operator llvm::error_code() const {
     return HasError ? *getErrorStorage() : llvm::error_code::success();
   }
 
+  error_code getError() const {
+    return HasError ? *getErrorStorage() : error_code::success();
+  }
+
   pointer operator ->() {
     return toPointer(getStorage());
   }