Pavel Yaskevich 80e4a2226b [ConstraintGraph] Don't try to contract edge of parameter bindings with inout attribute ...

Currently edge related to the parameter bindings is contracted
without properly checking if newly created equivalence class has
the same inout & l-value requirements. This patch improves the
situation by disallowing contraction of the edges related to parameter
binding constraint where left-hand side has `inout` attribute set.

Such guarantees that parameter can get `inout` type assigned when
argument gets `l-value` type.

Resolves: rdar://problem/33429010

2017-09-22 17:23:12 -07:00

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