Added proper checks for invalid operations.

Fixes all remaining failures in dEQP-GLES3.functional.lifetime*

Change-Id: Ia91ffdb8ced53f1f787b82ada0de22caf9ee9206
Reviewed-on: https://swiftshader-review.googlesource.com/13748Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>