infer results of a pattern from implicit defs. This allows you to do something

like this:

 def : Pat<(add ...),
           (FOOINST)>;

When fooinst only has a single implicit def (e.g. to R1).  This will be handled
as if written as (set R1, (FOOINST ...))



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98897 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/CodeGenDAGPatterns.h

@@ -88,6 +88,10 @@ namespace EEVT {
       return TypeVec;
     }
     
+    bool isVoid() const {
+      return TypeVec.size() == 1 && TypeVec[0] == MVT::isVoid;
+    }
+    
     /// hasIntegerTypes - Return true if this TypeSet contains any integer value
     /// types.
     bool hasIntegerTypes() const;