Add test case for build example

Author: Jamesbarford

tests/ui/issues/116729.rs

@@ -0,0 +1,8 @@
+//@ build-pass
+//@ rustc-env:CARGO_CRATE_NAME=build_script_build
+//@ compile-flags:-Cremark=all -Cdebuginfo=1
+//@ compile-flags:--crate-name=build_script_build
+
+fn main() {
+    _ = "".split('.');
+}