swift234

SIL: Targeted fix for materializeForSet emission for static generic property

This is part of the following commit in the master branch:

<https://github.com/apple/swift/commit/c0fb492cc0aec16f4fc91a31fe3daeadb5bc0598>

It is needed in conjunction with the following, which was already
cherry-picked into swift-2.2-branch:

<https://github.com/apple/swift/commit/7edc5db2c19bda835fcb027f651d2f00bb97533a>