When we meet function call, unary or ternary operator in SSBO access chain,
we should transfer the process of them to OutputHLSL.

Bug: angleproject:1951

Change-Id: I740940ac4eee4c5ed52239f14b1d32b1f9cf9385
Reviewed-on: https://chromium-review.googlesource.com/c/1290470Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jiajia Qin <jiajia.qin@intel.com>