Revert the commits that change OpArrayLength type and bumped the version number.

Now, version 5.* is all connected to making the uint type, which doesn't quite work.
Generator versions 4 and 6 do not do this.

Test/baseResults/hlsl.float4.frag.out

@@ -42,7 +42,7 @@ gl_FragCoord origin is upper left
 0:?     'anon@0' (layout( row_major std140) uniform block{ uniform 4-component vector of float AmbientColor,  uniform bool ff1, layout( offset=20) uniform float ff2, layout( binding=0 offset=32) uniform 4-component vector of float ff3, layout( binding=1 offset=48) uniform 4-component vector of float ff4})
 
 // Module Version 10000
-// Generated by (magic number): 80005
+// Generated by (magic number): 80006
 // Id's are bound by 26
 
                               Capability Shader