Carry decorations down type tree in WalkExplicitLayoutAccessChain

Carry decorations down type tree in WalkExplicitLayoutAccessChain

Bug: b/128690261
Bug: b/128872954
Test: dEQP-VK.*push_constant*
Test: dEQP-VK.glsl.*
Test: dEQP-VK.spirv_assembly.*
Change-Id: I0f8d103288777cd03347b32366ed5c5606e38b8d
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/27588
Presubmit-Ready: Chris Forbes <chrisforbes@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>