These are RAII-based helpers for ensuring that logic is executed, regardless of the control flow path taken.

Bug: b/139010488
Change-Id: I7bea0e550aaccf7504221a661ed2cd04e46018f9
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/34769Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>