Adding test as a copy into currently supported testsuite (for PR #5209) (#5216)

* Adding test as a copy into currently supported testsuite and comment lit runner regarding copied test

* removing erroneous comment

test/Transforms/lit.local.cfg

@@ -1,5 +1,8 @@
 config.unsupported = True # HLSL Change - Disable lit suites.
 
+# If these are enabled, a duplicate test was created here which can be deleted:
+#   tools/clang/test/HLSLFileCheck/passes/llvm/globalopt/alias-used.ll
+
 # Failing Tests (359):
 #     LLVM :: Transforms/ArgumentPromotion/2008-02-01-ReturnAttrs.ll
 #     LLVM :: Transforms/ArgumentPromotion/2008-07-02-array-indexing.ll

tools/clang/test/HLSLFileCheck/passes/llvm/globalopt/alias-used.ll

@@ -0,0 +1,47 @@
+; RUN: %opt %s -globalopt -S | FileCheck %s
+
+@c = global i8 42
+
+@i = internal global i8 42
+; CHECK: @ia = internal global i8 42
+@ia = internal alias i8* @i
+
[email protected] = appending global [3 x i8*] [i8* bitcast (void ()* @fa to i8*), i8* bitcast (void ()* @f to i8*), i8* @ca], section "llvm.metadata"
+; CHECK-DAG: @llvm.used = appending global [3 x i8*] [i8* @ca, i8* bitcast (void ()* @fa to i8*), i8* bitcast (void ()* @f to i8*)], section "llvm.metadata"
+
[email protected] = appending global [4 x i8*] [i8* bitcast (void ()* @fa3 to i8*), i8* bitcast (void ()* @fa to i8*), i8* @ia, i8* @i], section "llvm.metadata"
+; CHECK-DAG: @llvm.compiler.used = appending global [2 x i8*] [i8* bitcast (void ()* @fa3 to i8*), i8* @ia], section "llvm.metadata"
+
+@sameAsUsed = global [3 x i8*] [i8* bitcast (void ()* @fa to i8*), i8* bitcast (void ()* @f to i8*), i8* @ca]
+; CHECK-DAG: @sameAsUsed = global [3 x i8*] [i8* bitcast (void ()* @f to i8*), i8* bitcast (void ()* @f to i8*), i8* @c]
+
+@other = global i32* bitcast (void ()* @fa to i32*)
+; CHECK-DAG: @other = global i32* bitcast (void ()* @f to i32*)
+
+@fa = internal alias void ()* @f
+; CHECK: @fa = internal alias void ()* @f
+
+@fa2 = internal alias void ()* @f
+; CHECK-NOT: @fa2
+
+@fa3 = internal alias void ()* @f
+; CHECK: @fa3
+
+@ca = internal alias i8* @c
+; CHECK: @ca = internal alias i8* @c
+
+define void @f() {
+  ret void
+}
+
+define i8* @g() {
+  ret i8* bitcast (void ()* @fa to i8*);
+}
+
+define i8* @g2() {
+  ret i8* bitcast (void ()* @fa2 to i8*);
+}
+
+define i8* @h() {
+  ret i8* @ca
+}