We call the constructor, so make sure we also call the destructor.
Prevents non-POD inner fields from being deallocated without a destructor call before being freed.

Change-Id: Ibf1291619f0ab4c7f7761a80a045d605fa9cbd53
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/31813Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>