Used range-based for loop where it was trivial to do so.
This change should be noop in terms of functionality.

Change-Id: I3d692cc2706f35f5b710e7539fa084365cf28af1
Reviewed-on: https://swiftshader-review.googlesource.com/14628Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>