Incorrect DXC codegen for constant buffer bool vector access #1740

bool2 b2;
float main() : SV_TARGET
{
  uint x = b2[1];
  return x;
}

define void @main() {
  %"$Globals_cbuffer" = call %dx.types.Handle @dx.op.createHandle(i32 57, i8 2, i32 0, i32 0, i1 false)  ; CreateHandle(resourceClass,rangeId,index,nonUniformIndex)
  %1 = call %dx.types.CBufRet.i32 @dx.op.cbufferLoadLegacy.i32(i32 59, %dx.types.Handle %"$Globals_cbuffer", i32 0)  ; CBufferLoadLegacy(handle,regIndex)
  %2 = extractvalue %dx.types.CBufRet.i32 %1, 1
  %.i1 = icmp eq i32 %2, 0 ; <------------ !!!
  %3 = uitofp i1 %.i1 to float
  call void @dx.op.storeOutput.f32(i32 5, i32 0, i32 0, i8 0, float %3)  ; StoreOutput(outputSigId,rowIndex,colIndex,value)
  ret void
}