Revert "Tests: Delete SymbolGraph/infer-target.swift."

This reverts commit 6271a46.

Author: tshortli

test/SymbolGraph/infer-target.swift

@@ -0,0 +1,19 @@
+// RUN: %empty-directory(%t)
+// RUN: %empty-directory(%t/Output)
+// RUN: %target-build-swift %s -module-name Basic -emit-module -emit-module-path %t/
+
+// Verify that -target can be inferred
+// RUN: %empty-directory(%t/Output)
+// RUN: %swift-symbolgraph-extract -module-name Basic -I %t -pretty-print -output-dir %t/Output
+// RUN: %FileCheck %s --input-file %t/Output/Basic.symbols.json
+
+// This test can only work for test configurations that aren't cross-compiling.
+// REQUIRES: OS=macosx || OS=linux-gnu || OS=windows-msvc
+
+public struct S {
+  public var x: Int
+}
+
+// CHECK: "kind": "memberOf"
+// CHECK-NEXT: "source": "s:5Basic1SV1xSivp"
+// CHECK-NEXT: "target": "s:5Basic1SV"