nir/spirv: Fix warning and add missing breaks.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/compiler/spirv/spirv_to_nir.c

@@ -3361,10 +3361,12 @@ vtn_handle_preamble_instruction(struct vtn_builder *b, SpvOp opcode,
 
       case SpvCapabilityGroupNonUniformQuad:
          spv_check_supported(subgroup_quad, cap);
+         break;
 
       case SpvCapabilityGroupNonUniformArithmetic:
       case SpvCapabilityGroupNonUniformClustered:
          spv_check_supported(subgroup_arithmetic, cap);
+         break;
 
       case SpvCapabilityVariablePointersStorageBuffer:
       case SpvCapabilityVariablePointers:

src/compiler/spirv/vtn_subgroup.c

@@ -277,6 +277,8 @@ vtn_handle_subgroup(struct vtn_builder *b, SpvOp opcode,
       case 2:
          op = nir_intrinsic_quad_swap_diagonal;
          break;
+      default:
+         vtn_fail("Invalid constant value in OpGroupNonUniformQuadSwap");
       }
       vtn_build_subgroup_instr(b, op, val->ssa, vtn_ssa_value(b, w[4]),
                                NULL, 0, 0);