Rollup merge of #155897 - wesleywiser:test_83060, r=jieyouxu

Add regression test for LLVM bug with huge stack frames

Regression test for #83060

Closes #83060

Author: jhpratt

tests/ui/codegen/huge-stacks.rs

@@ -0,0 +1,23 @@
+//@ revisions: unoptimized optimized
+//@[optimized]compile-flags: -O
+//@ run-pass
+//@ only-64bit
+//@ min-llvm-version: 22
+
+// Regression test for https://github.com/rust-lang/rust/issues/83060
+
+fn func() {
+    const CAP: usize = std::u32::MAX as usize;
+    let mut x: [u8; CAP] = [0; CAP];
+    x[2] = 123;
+    assert_eq!(x[2], 123);
+}
+
+fn main() {
+    std::thread::Builder::new()
+        .stack_size(5 * 1024 * 1024 * 1024)
+        .spawn(func)
+        .unwrap()
+        .join()
+        .unwrap();
+}