Tests: Add XFAIL-ing test/Driver/static-stdlib-linux-lld.swift

`-use-ld=lld` and `-static-stdlib` combination is now brokwn due to
duplicate symbous for unicode properties impls between stdlib and
StringProcessing library, which is recently defaulted.

Author: kateinoigakukun

test/Driver/static-stdlib-linux-lld.swift

@@ -0,0 +1,12 @@
+// Statically link a "hello world" program
+// REQUIRES: OS=linux-gnu
+// REQUIRES: static_stdlib
+// REQUIRES: lld_lto
+// XFAIL: *
+print("hello world!")
+// RUN: %empty-directory(%t)
+// RUN: %target-swiftc_driver -static-stdlib -use-ld=lld %import-static-libdispatch -o %t/static-stdlib-lld %s
+// RUN: %t/static-stdlib-lld | %FileCheck %s
+// RUN: ldd %t/static-stdlib-lld | %FileCheck %s --check-prefix=LDD
+// CHECK: hello world!
+// LDD-NOT: libswiftCore.so