Imported some of the more trivial bug fixes:
- Added a few missing interface block cases
- Added checks for varying structs
- Added checks for unsized arrays
- Added first-class array check for pre ES3 compilation
- Added check that ES3 functions do not use builtin names (ES3 only)
- Added more binary operator checks

Change-Id: I3d75453f17e1123478ef7da0998e869970a7fb7d
Reviewed-on: https://swiftshader-review.googlesource.com/8289Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>