[5.9][move-only] Fix lazily initialized global initializers.

[gottesmm]

• Description: Without this, we emit a copy of noncopyable type error since we do not insert a mark_must_check on lazily initialized global initializers.

The language impact is that without this when we write code like the following we emit a copyable of noncopyable type error since the checker does not actually run on the lazily initialized globals.

var m1 = M4("1")
var m2 = M4("1")
struct Doit {
   static var m3 = M4("1")
   static var m4 = M4("1")
   static func run() {
       rewriteTwo(&m.s1, &m2.s2)
       rewriteTwo(&m3.s1, &m4.s2)
   }
}

• Risk: Very low. The fix involves us inserting a mark_must_check on a specific code pattern that did not have a mark_must_check inserted. So this should only involve noncopyable types and further only when this very specific code pattern is emitted by SILGen. The fix is very localized.
• Original PR: #67354
• Reviewed By: @jckarter @atrick
• Testing: Added Swift and SIL tests
• Resolves: rdar://111402912

[gottesmm]

@swift-ci test

[gottesmm]

#67354