Merge branch 'master' of https://gitlab.tiker.net/inducer/loopy into explicit_simd_temporaries_fixes

Improve/generalize interface to temporary privatization

See merge request !256

Ignore boostable for real in language version 2018.2

See merge request !255

Boostable-into is a mistake

See merge request inducer/loopy!253

Fixing a typo

See merge request inducer/loopy!254

Exclude concurrent inames from get_iname_duplication_options because they are never explicitly 'entered'

More speed ups for loading from cache.

See merge request inducer/loopy!251

- Cache written variable names in the kernel (#135)
- Make LoopyEqKeyBuilder.hash_key() return a hash, so that
  instructions don't have to be re-hashed when they are loaded from
  cache.

Adding global id strides to mem access

See merge request inducer/loopy!248

Merge branch 'master' of https://gitlab.tiker.net/inducer/loopy into explicit_simd_temporaries_fixes