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

Reduce logger chattiness during kernel creation

See merge request !244

This reverts commit 96317d00.

Reduce cache-to-execution latency by using lazy unpickling of instructions.

Closes #67

See merge request inducer/loopy!242

of instructions.

This requires caching the generation of invokers (which itself should
also give a speed boost), since invoker generation needed to analyze
the instructions in the kernel.

allowing stride=0 in make_args and make_ref_args by calculating alloc_size as if stride=1

See merge request !241