[WebAssembly] Update calls to computeKnownBits after the changes from r301620.

I didn't realize WebAssembly wasn't a default build target so I missed that changes were needed.

llvm-svn: 301629
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrMemory.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrMemory.td
index 25d77bb..f0c49f4 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyInstrMemory.td
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrMemory.td
@@ -33,11 +33,11 @@
   if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N->getOperand(1)))
     return CurDAG->MaskedValueIsZero(N->getOperand(0), CN->getAPIntValue());
 
-  APInt KnownZero0, KnownOne0;
-  CurDAG->computeKnownBits(N->getOperand(0), KnownZero0, KnownOne0, 0);
-  APInt KnownZero1, KnownOne1;
-  CurDAG->computeKnownBits(N->getOperand(1), KnownZero1, KnownOne1, 0);
-  return (~KnownZero0 & ~KnownZero1) == 0;
+  KnownBits Known0;
+  CurDAG->computeKnownBits(N->getOperand(0), Known0, 0);
+  KnownBits Known1;
+  CurDAG->computeKnownBits(N->getOperand(1), Known1, 0);
+  return (~Known0.Zero & ~Known1.Zero) == 0;
 }]>;
 
 // GlobalAddresses are conceptually unsigned values, so we can also fold them