Previously this was left uninitialized, with exciting results when a shader used it for buffer indexing etc. Bug: b/126871859 Test: dEQP-VK.*push_constant* Test: dEQP-VK.glsl.* Test: dEQP-VK.spirv_assembly.* Change-Id: I57fb9e22cbe57a87072b1039a7d799bedd28ae91 Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/27628 Presubmit-Ready: Chris Forbes <chrisforbes@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com> Reviewed-by: Ben Clayton <bclayton@google.com> Tested-by: Chris Forbes <chrisforbes@google.com> Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
