Update out-param semantics in SPIR-V.
Removed a special case from `writeFunctionCallArgument` which avoided
using a scratch variable for out params; now we always use the scratch
variable and copy it back to the original variable at the end.
Change-Id: I0e446a3fde6d19554943384210bd911f6f9c8cfa
Bug: skia:11052, skia:11919, skia:12858
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/501836
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
15 files changed
