1.  Literal to vector assignment (no explicit conversion should be used)
2.  Non-vector temporary variable to vector assignment (no explicit conversion)
3.  Vector-temporary to vector variable assignment (explicit conversion)

Previously, only vector to vector assignment was tested.

This reverts commit 61653be0.

incorporate two different privitizing 'flavors', one for ILP and one for vectorization -- the main difference is that vectorization requires a _direct_ write-dependency on the vectorizing iname, whereas an ILP promotion simply requires that the temporary is inside an ILP-loop

Correct improper use of 'find_recursive_dependencies', this refers to user-specified instruction dependencies, not general 'dependencies'.
Besides the recursive write-map application technique is capable of handling the cases the recursive instruction dependency approach was trying to fix

Precompute default tag mandatory

See merge request inducer/loopy!268

Ensure unpickles equally on callbacks

Closes #136

See merge request inducer/loopy!267

Reenable pypy and binary-build CI

See merge request inducer/loopy!266

No defaultdict for iname to tags

See merge request inducer/loopy!265

Merge branch 'add-local-strides-global-strides-and-var-name-to-local-mem-access-stats' into 'master'

Now counting lid strides, gid strides, and variable name in LocalMemAccessCounter. Updated tests accordingly.

See merge request inducer/loopy!263

Fix various issues with dependency cycles

See merge request inducer/loopy!264

draw_dependencies_as_unicode_arrows: Fix (never-ending) drawing of downward arrows, indicating cyclic deps