[SPIR-V] GetAttributeAtVertex generates invalid SPIR-V with `-O0` and a shared type between nointerpolation and normal.

Repro:

struct S {
  float a;
  float b;
};

float4 main(nointerpolation S s1 : A, S s2 : B) : SV_Target
{
  return float4(GetAttributeAtVertex(s1.a, 1) + s2.a, 0, 0, 0);
}

./build/bin/dxc -E main -T ps_6_1 ./test.hlsl -spirv -O0

Error:

fatal error: generated SPIR-V is invalid: Expected Constituent type to be equal to the corresponding member type of Result Type struct
  %32 = OpCompositeConstruct %S %30 %31

note: please file a bug report on https://github.com/Microsoft/DirectXShaderCompiler/issues with source code if possible

The reason is -O0 doesn't force inlining, hence the bug shows up.
The bug is around the definition of the struct S:

• %S = OpTypeStruct %_arr_float_uint_3 %_arr_float_uint_3
  Because the first param is marked nointerpolation, the struct becomes an array of structs.
  Then, in the wrapper function that creates the struct to pass them to main, the same type is used twice: once to create the array of structs (good), and once to create a simple struct (bad)

         %27 = OpLoad %_arr_float_uint_3 %in_var_A
         %28 = OpLoad %_arr_float_uint_3 %in_var_A1
         %29 = OpCompositeConstruct %S %27 %28
               OpStore %param_var_s1 %29
         %30 = OpLoad %float %in_var_B
         %31 = OpLoad %float %in_var_B1
         %32 = OpCompositeConstruct %S %30 %31
               OpStore %param_var_s2 %32
         %33 = OpFunctionCall %v4float %src_main %param_var_s1 %param_var_s2

Reproduce the issue with build/bin/dxc using the provided test.hlsl source and -spirv -O0. Inspect the SPIR-V wrapper generation around the %S struct and the OpCompositeConstruct instructions; done means the command no longer produces invalid SPIR-V for the repro.