[WebAssembly] Add getSetCCResultType placeholder override to handle vector compare results.

Necessary to get the rL335821 bugfix (which was reverted at rL335871) un-reverted.

llvm-svn: 335884
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.h b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.h
index ba42d20..7981949 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.h
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.h
@@ -64,6 +64,9 @@
                                       bool *Fast) const override;
   bool isIntDivCheap(EVT VT, AttributeList Attr) const override;
 
+  EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
+                         EVT VT) const override;
+
   SDValue LowerCall(CallLoweringInfo &CLI,
                     SmallVectorImpl<SDValue> &InVals) const override;
   bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,