Support assigning array constructors in HLSL output This adds support to the following type of shader code, where an array constructor is used as a source of assignment: float a[3]; a = float[3](0.0, 1.0, 2.0); The assignment gets replaced in the HLSL code by a function call where the array is an out parameter and the constructor parameters are regular parameters. Constructors cannot yet be used in initializers. With this change in place, some of the relevant dEQP tests start passing. TEST=dEQP-GLES3.functional.shaders.arrays.constructor.* BUG=angleproject:941 Change-Id: I13ed603c02a30d9f9950a61c4d562ae9fac058ec Reviewed-on: https://chromium-review.googlesource.com/263403 Reviewed-by: Olli Etuaho <oetuaho@nvidia.com> Tested-by: Olli Etuaho <oetuaho@nvidia.com>