[SYCL] Stabilize LIT tests in different environments

 - llvm-foreach-win.ll use xcopy instead copy to get the same results in
   Windows and MINGW console (copy is not available in MINGW).

llvm/test/tools/llvm-foreach/llvm-foreach-win.ll

@@ -9,7 +9,7 @@
 ; CHECK: [[FIRST:.+1.tgt]]
 ; CHECK: [[SECOND:.+2.tgt]]
 ;
-; RUN: llvm-foreach --in-replace="{}" --out-replace=%t --out-ext=out --in-file-list=%t.list --out-file-list=%t.out.list -- copy "{}" %t
+; RUN: llvm-foreach --in-replace="{}" --out-replace=%t --out-ext=out --in-file-list=%t.list --out-file-list=%t.out.list -- xcopy /y "{}" %t
 ; RUN: FileCheck < %t.out.list %s --check-prefix=CHECK-LIST
 ; CHECK-LIST: [[FIRST:.+\.out]]
 ; CHECK-LIST: [[SECOND:.+\.out]]