skip 16bit register for wmm reg sorting

Author: broxigarchen

llvm/lib/Target/AMDGPU/SIFrameLowering.cpp

@@ -1650,8 +1650,9 @@ void SIFrameLowering::determineCalleeSaves(MachineFunction &MF,
     // are of 32-bit size. SIPreAllocateWWMRegs pass can add tuples into WWM
     // reserved registers.
     const TargetRegisterClass *RC = TRI->getPhysRegBaseClass(Reg);
-    if (TRI->getRegSizeInBits(*RC) > 32)
+    if (TRI->getRegSizeInBits(*RC) != 32)
       continue;
+
     SortedWWMVGPRs.push_back(Reg);
   }