Vulkan: Fix qualifier replacement for sampler arrays. The uniform name by default has the array subscript [0] appended. In the shader code it uses no subscript. Fix this by parsing out the subscript in the glslang wrapper subsitution step. This is a preliminary fix. More work on descriptor set layouts and pipeline layouts will be necessary to support sampler arrays. Bug: angleproject:2462 Change-Id: I57d6304f33822d588c7cb192607380c2f3ba20f5 Reviewed-on: https://chromium-review.googlesource.com/1089808 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Luc Ferron <lucferron@chromium.org> Reviewed-by: Frank Henigman <fjhenigman@chromium.org>