Re-enable and update testcase that was disabled in 8a5ed40.

<rdar://problem/24428756>

Author: adrian-prantl

test/DebugInfo/basic.swift

@@ -19,8 +19,6 @@
 // RUN: %target-swift-frontend %s -emit-ir -g -o - | FileCheck %s
 // RUN: %target-swift-frontend %s -emit-ir -g -o - -disable-sil-linking | FileCheck %s --check-prefix=CHECK-NOSIL
 // --------------------------------------------------------------------
-// FIXME: <rdar://problem/24428756> DebugInfo/basic.swift test fails after fixing var params
-// REQUIRES: disabled
 //
 // CHECK: foo
 // CHECK-DAG: ret{{.*}}, !dbg ![[RET:[0-9]+]]
@@ -29,7 +27,7 @@ public
 func foo(_ a: Int64, _ b: Int64) -> Int64 {
      var a = a
      var b = b
-     // CHECK-DAG: !DILexicalBlock(scope: ![[FOO]],{{.*}} line: [[@LINE-3]], column: 41)
+     // CHECK-DAG: !DILexicalBlock(scope: ![[FOO]],{{.*}} line: [[@LINE-3]], column: 43)
      // CHECK-DAG: ![[ASCOPE:.*]] = !DILocation(line: [[@LINE-4]], column: 10, scope: ![[FOO]])
      // Check that a is the first and b is the second argument.
      // CHECK-DAG: store i64 %0, i64* [[AADDR:.*]], align 8