Fix a subtle multiclass bug: when using class inheritance on

a toplevel 'defm', make sure to properly resolve references.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106570 91177308-0d34-0410-b5e6-96231b3b80d8

test/TableGen/defmclass.td

@@ -16,6 +16,7 @@ class BaseI {
 class I<bits<4> op> : BaseI {
   bits<4> opcode = op;
   int val = !if(!eq(Prefix, xd.Prefix), 7, 21);
+  int check = !if(hasVEX_4VPrefix, 0, 10);
 }
 
 multiclass R {
@@ -33,4 +34,5 @@ multiclass Y {
   defm SD : R, M, XS;
 }
 
+// CHECK: int check = 0;
 defm Instr : Y, VEX;