Crash compiling shader

[damyanp]

The following shader causes the compiler to crash:

Repro: https://godbolt.org/z/PK3KW4Exr

// -T ps_6_6
float4 main() : SV_TARGET {
  float4 arr[2] = {1,2,3,4,5,6,7,8};
  arr[0][(int)float1(7)] = 9.0;
  return arr[0];
}