Another attempt at supporting non-contiguous arrays#172

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SyamGadde wants to merge 35 commits intoinducer:mainfrom

SyamGadde:noncontig2

Commits on Mar 1, 2018

Commit only DeferredSourceModule support without changing calling behavior of users of get_elwise_module or get_elwise_range_module, to test backwards compatibility and performance.
Syam Gadde
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Smarter _new_like_me that handles discontiguous input. Have copy() use it too.
Syam Gadde
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Allow existing kernel calls to use non-contiguous arrays by sending actual GPUArrays and using ARRAY_i indices (rather than just i).
Syam Gadde
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Allow setting scalars.
Syam Gadde
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Fix kernel name.
Syam Gadde
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Fix _array_like_helper to work with non-contiguous arrays.
Syam Gadde
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Commits on Mar 15, 2018

Minor, but important fixes to index calculations!
Syam Gadde
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Let _memcpy_discontig fall back to generic assignment kernel.
Syam Gadde
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Fix arange for complex arguments.
Syam Gadde
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Prettify/rearrange kernel source.
Syam Gadde
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Fix contiguity-match test.
Syam Gadde
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Commits on Mar 22, 2018

Make "slow" memcpy work for host arrays too.
Syam Gadde
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Just in case there are any strides == 0.
Syam Gadde
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Commits on Mar 23, 2018

Fix memcpy_discontig_slow for host-side src.
Syam Gadde
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Fix some instances of incompatible strides.
Syam Gadde
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Commits on May 29, 2018

Compile regexes once per source object.
Syam Gadde
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Commits on May 31, 2018

Faster _flip_negative_strides (and earlier short-circuit), plus a variable name change from "slicer" to "flipper".
Syam Gadde
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Be smarter/faster calculating keys for deferred source.
Syam Gadde
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Fix prototype.
Syam Gadde
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Add tests for non-contiguous arrays.
Syam Gadde
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Don't need to transfer src to host.
Syam Gadde
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Ignore zero-strides in singleton dimensions (which will be culled later anyway).
Syam Gadde
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Commits on Jun 25, 2018

"precalc" performance improvements.
Syam Gadde
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Don't delete a variable that is used later.
Syam Gadde
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Commits on Jul 5, 2018

Allow DeferredSource to take a string in constructor.
Syam Gadde
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Many updates including:
Syam Gadde
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Fix string interpolation bug.
Syam Gadde
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Small performance improvement.
Syam Gadde
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Commits on Jul 9, 2018

Fix comment.
Syam Gadde
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Commits on Jul 31, 2018

Interpolation fixes.
Syam Gadde
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Make sure casting works for both built-in types and classes with constructors.
Syam Gadde
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Commits on Aug 3, 2018

Clean up DeferredVal implementation (_eval becomes _get, _evalbase becomes _eval) and documentation. Get rid of evalcont parameter in favor of explicit _set_mod() call.
Syam Gadde
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Commits on Aug 27, 2018