Correct over-zealous removal of hack.

Some code want to check that *any* call within a function has the 'returns
twice' attribute, not just that the current function has one.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142221 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Function.h

@@ -425,6 +425,10 @@ public:
   ///
   bool hasAddressTaken(const User** = 0) const;
 
+  /// callsFunctionThatReturnsTwice - Return true if the function has a call to
+  /// setjmp or other function that gcc recognizes as "returning twice".
+  bool callsFunctionThatReturnsTwice() const;
+
 private:
   // Shadow Value::setValueSubclassData with a private forwarding method so that
   // subclasses cannot accidentally use it.