[Test] Add regression test.

For #72055 .

Author: nate-chandler

validation-test/SILOptimizer/gh72055.swift

@@ -0,0 +1,52 @@
+// RUN: %target-swift-frontend -emit-sil -verify %s
+
+struct PinnedInfo {
+    var hasPinnedCells: Bool {
+        return !allPins.isEmpty
+    }
+
+    var allPins: ContiguousArray<Int>
+
+    init(allPins: ContiguousArray<Int> = []) {
+        self.allPins = allPins
+    }
+}
+
+enum ModelState: Hashable, CaseIterable {
+    case initial
+    case modified
+}
+
+struct Storage<Model> {
+    var initial: Model?
+    var modified: Model?
+
+    mutating func setStorage(_ storage: Model, at state: ModelState) {
+            switch state {
+            case .initial:
+                initial = storage
+            case .modified:
+                modified = storage
+            }
+        }
+}
+
+func test() {
+  var storagePinInfo = Storage<PinnedInfo>()
+  var storageAllPins = Storage<Array<Int>>()
+
+  var pinInfo = PinnedInfo(allPins: []) // expected-warning{{variable 'pinInfo' was never mutated; consider changing to 'let' constant}}
+  var allPins = Array(repeating: 0, count: 100) // expected-warning{{variable 'allPins' was never mutated; consider changing to 'let' constant}}
+
+  storagePinInfo.setStorage(consume pinInfo, at: .initial)
+  storageAllPins.setStorage(consume allPins, at: .initial)
+}
+
+var storagePinInfo = Storage<PinnedInfo>()
+var storageAllPins = Storage<Array<Int>>()
+
+var pinInfo = PinnedInfo(allPins: [])
+var allPins = Array(repeating: 0, count: 100)
+
+storagePinInfo.setStorage(consume pinInfo, at: .initial) // expected-error{{'consume' cannot be applied to globals}}
+storageAllPins.setStorage(consume allPins, at: .initial) // expected-error{{'consume' cannot be applied to globals}}