Add regression test for issue #76042

Author: LeSeulArtichaut

src/test/ui/issues/issue-76042.rs

@@ -0,0 +1,16 @@
+// run-pass
+// compile-flags: -Coverflow-checks=off -Ccodegen-units=1 -Copt-level=0
+
+fn foo(a: i128, b: i128, s: u32) -> (i128, i128) {
+    if s == 128 {
+        (0, 0)
+    } else {
+        (b >> s, a >> s)
+    }
+}
+fn main() {
+    let r = foo(0, 8, 1);
+    if r.0 != 4 {
+        panic!();
+    }
+}