Add suggested braces for subobject initialization.

Bug 15387371

Change-Id: I771b6e9f30669aade18eba8b3749fcb71ae8ef97
Reviewed-on: https://swiftshader-review.googlesource.com/4501
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>