[CodeCompletion] Simplify a FileCheck test

Only check lines we really care about.

Author: rintaro

test/SourceKit/CodeComplete/complete_from_system.swift

@@ -11,32 +11,12 @@ func test(col: MyCollection) {
 
 // RUN: %sourcekitd-test -req=complete -pos=9:7 %s -- %s -module-name TestMod | %FileCheck %s
 
-// CHECK: {
-// CHECK: key.kind: source.lang.swift.decl.function.method.instance,
 // CHECK: key.name: "makeIterator()",
-// CHECK-NEXT: key.sourcetext: "makeIterator()",
-// CHECK-NEXT: key.description: "makeIterator()",
-// CHECK-NEXT: key.typename: "IndexingIterator<MyCollection>",
-// CHECK-NEXT: key.doc.brief: "{{.*}}",
-// CHECK-NEXT: key.context: source.codecompletion.context.superclass,
-// CHECK-NEXT: key.typerelation: source.codecompletion.typerelation.unrelated,
-// CHECK-NEXT: key.num_bytes_to_erase: 0,
-// CHECK-NEXT: key.is_system: 1,
-// CHECK-NEXT: key.associated_usrs: "s:Slss16IndexingIteratorVyxG0B0RtzrlE04makeB0ACyF",
-// CHECK-NEXT: key.modulename: "Swift"
-// CHECK-NEXT: },
-// CHECK: {
-// CHECK: key.kind: source.lang.swift.decl.var.instance,
-// CHECK: key.name: "startIndex",
-// CHECK-NEXT: key.sourcetext: "startIndex",
-// CHECK-NEXT: key.description: "startIndex",
-// CHECK-NEXT: key.typename: "Int",
-// CHECK-NEXT: key.doc.brief: "{{.*}}",
-// CHECK-NEXT: key.context: source.codecompletion.context.thisclass,
-// CHECK-NEXT: key.typerelation: source.codecompletion.typerelation.unrelated,
-// CHECK-NEXT: key.num_bytes_to_erase: 0,
-// CHECK-NOT: key.is_system: 1,
-// CHECK-NEXT: key.associated_usrs: "s:7TestMod12MyCollectionV10startIndexSivp s:Sl10startIndex0B0Qzvp",
-// CHECK-NEXT: key.modulename: "TestMod"
-// CHECK-NEXT: },
+// CHECK-NOT: },
+// CHECK: key.is_system: 1
+// CHECK: },
 
+// CHECK: key.name: "startIndex",
+// CHECK-NOT: },
+// CHECK-NOT: key.is_system: 1
+// CHECK: },