Chris Lattner de289752fe Implement a few silcombine transformations for arrays (#13652) ...

* Implement a few silcombine transformations for arrays

 - Useless existential_ref <-> class conversions.
 - mark_dependence_inst depending on uninteresting instructions.
 - release(init_existential_ref(x)) -> release(x) when hasOneUse(x)
 - Update COWArrayOpt to handle the new forms generated by this.

these aren't massive performance wins, but do shrink the size of SIL when
dealing with arrays.

* Generalize testcase to work on linux and on mac when checking stdlib is enabled.

2017-12-30 22:30:37 -08:00

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