Fix array function parameter syntax in HLSL equality function The fact that passing shaders to the platform compiler is deferred until linking is performed allowed this bug to pass undetected in earlier manual testing. TEST=WebGL conformance tests BUG=angleproject:941 Change-Id: Ic12b5d0c5547057551df90086453e897a161d559 Reviewed-on: https://chromium-review.googlesource.com/263221 Tested-by: Olli Etuaho <oetuaho@nvidia.com> Reviewed-by: Nicolas Capens <capn@chromium.org>