[Test] Add tests for unowned, nonisolated, and access control set completion

Author: a7medev

test/IDE/complete_access_control_set.swift

@@ -0,0 +1,27 @@
+// RUN: %batch-code-completion
+
+// ACCESS_CONTROL_SET: Keyword/None:                       set; name=set
+
+public(#^PUBLIC_TOP_LEVEL?check=ACCESS_CONTROL_SET^#) var var1 = 0
+
+private(#^PRIVATE_TOP_LEVEL?check=ACCESS_CONTROL_SET^#) var var2 = 0
+
+internal(#^INTERNAL_TOP_LEVEL?check=ACCESS_CONTROL_SET^#) var var3 = 0
+
+fileprivate(#^FILEPRIVATE_TOP_LEVEL?check=ACCESS_CONTROL_SET^#) var var4 = 0
+
+package(#^PACKAGE_TOP_LEVEL?check=ACCESS_CONTROL_SET^#) var var5 = 0
+
+struct MyStruct {
+  public(#^PUBLIC_IN_STRUCT?check=ACCESS_CONTROL_SET^#) var prop1: Int = 0
+
+  private(#^PRIVATE_IN_STRUCT?check=ACCESS_CONTROL_SET^#) var prop2: Int = 0
+
+  open(#^OPEN_IN_STRUCT?check=ACCESS_CONTROL_SET^#) var prop3: Int = 0
+
+  internal(#^INTERNAL_IN_STRUCT?check=ACCESS_CONTROL_SET^#) var prop4: Int = 0
+
+  fileprivate(#^FILEPRIVATE_IN_STRUCT?check=ACCESS_CONTROL_SET^#) var prop5: Int = 0
+
+  package(#^PACKAGE_IN_STRUCT?check=ACCESS_CONTROL_SET^#) var prop6: Int = 0
+}

test/IDE/complete_nonisolated_unsafe.swift

@@ -0,0 +1,9 @@
+// RUN: %batch-code-completion
+
+// NONISOLATED_UNSAFE: Keyword/None:                       unsafe; name=unsafe
+
+nonisolated(#^NONISOLATED_UNSAFE_TOP_LEVEL?check=NONISOLATED_UNSAFE^#) var count = 0
+
+struct MyStruct {
+  nonisolated(#^NONISOLATED_UNSAFE_IN_STRUCT?check=NONISOLATED_UNSAFE^#) var prop = 0
+}

test/IDE/complete_unowned_parameter.swift

@@ -0,0 +1,10 @@
+// RUN: %batch-code-completion
+
+// UNOWNED_PARAMETER-DAG: Keyword/None:                       safe; name=safe
+// UNOWNED_PARAMETER-DAG: Keyword/None:                       unsafe; name=unsafe
+
+unowned(#^UNOWNED_TOP_LEVEL?check=UNOWNED_PARAMETER^#) var count = 0
+
+struct MyStruct {
+  unowned(#^UNOWNED_IN_STRUCT?check=UNOWNED_PARAMETER^#) var prop: Int = 0
+}