Add regression test for rust-lang#100772

Signed-off-by: Yuki Okushi <[email protected]>

src/test/ui/lto/issue-100772.rs

@@ -0,0 +1,10 @@
+// run-pass
+// needs-sanitizer-cfi
+// compile-flags: -Zsanitizer=cfi -Clto
+// no-prefer-dynamic
+
+#![feature(allocator_api)]
+
+fn main() {
+    let _ = Box::new_in(&[0, 1], &std::alloc::Global);
+}