tests/sksl/runtime_errors/LoopExpressionErrors.skvm

### Compilation failed:

error: 3: missing loop expression
error: 5: invalid operator in loop expression
error: 6: loop index must be modified by a constant expression
error: 7: invalid operator in loop expression
error: 8: invalid operator in loop expression
error: 12: loop index must be modified by a constant expression
error: 13: loop index must be modified by a constant expression
7 errors