Add codegen tests for issues fixed by LLVM 16

Fixes #75978.
Fixes #99960.
Fixes #101048.
Fixes #101082.
Fixes #101814.
Fixes #103132.
Fixes #103327.

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/codegen/issues/issue-75978.rs b/tests/codegen/issues/issue-75978.rs
new file mode 100644
index 00000000000..f335e92c3dc
--- /dev/null
+++ b/tests/codegen/issues/issue-75978.rs
@@ -0,0 +1,19 @@
+// compile-flags: -O
+// min-llvm-version: 16
+
+#![crate_type = "lib"]
+
+#[no_mangle]
+pub fn test() -> u32 {
+    // CHECK-LABEL: @test(
+    // CHECK: ret i32 13
+    let s = [1, 2, 3, 4, 5, 6, 7];
+
+    let mut iter = s.iter();
+    let mut sum = 0;
+    while let Some(_) = iter.next() {
+        sum += iter.next().map_or(1, |&x| x)
+    }
+
+    sum
+}