incompatible_static_name_resolution_in_build_files

[laurentlb]

Tracking issue for the implementation of https://github.com/bazelbuild/proposals/blob/master/designs/2018-06-18-name-resolution.md in BUILD files.

This will align the semantics of BUILD files with the semantics of bzl files and bring more consistency. This will also help simplify our code and implement performance optimizations in the future.

This will fix a bug where this code was allowed:

[nonexistent for x in []]

When the flag is enabled, this will be an error (nonexistent is not defined), even though the expression is not evaluated as the list is empty.