Shader compiler issue with any() use on iOS

We target MSL 1.1 on iOS9, and are seeing non-equivalence to the following. The upper code gens bad pixels on iOS but is the more efficient form. macOS (on AMD 5500m) is fine. I will log this to Feedback Assistant, but also here too.

The code was also compiled with -O2. So could be an iOS optimizer bug.

Code Block 
#if 1
   if ( all( greaterThanEqual(pos.xy, v_clip.xy )) &&
	     all( lessThanEqual(pos.xy, v_clip.zw )) )
#else
	if ( pos.x >= v_clip.x && pos.x <= v_clip.z &&
          pos.y >= v_clip.y && pos.y <= v_clip.w )
#endif
This is codgen out of spirv-cross.  Mac and iOS codegen is the same for this chunk.
These are on iOS
With #1, this doesn't work:
fsmain_out out = {};
    float4 color = float4(0.0);
    float2 pos = gl_FragCoord.xy;
    bool _35 = all(pos >= in.v_clip.xy);
    bool _43;
    if (_35)
    {
        _43 = all(pos <= in.v_clip.zw);
    }
    else
    {
        _43 = _35;
    }
    if (_43) ...
     
With #0, this works
fsmain_out out = {};
    float4 color = float4(0.0);
    float2 pos = gl_FragCoord.xy;
    bool _38 = pos.x >= in.v_clip.x;
    bool _47;
    if (_38)
    {
        _47 = pos.x <= in.v_clip.z;
    }
    else
    {
        _47 = _38;
    }
    bool _56;
    if (_47)
    {
        _56 = pos.y >= in.v_clip.y;
    }
    else
    {
        _56 = _47;
    }
    bool _65;
    if (_56)
    {
        _65 = pos.y <= in.v_clip.w;
    }
    else
    {
        _65 = _56;
    }
    if (_65)