diff --git a/src/llvm-project b/src/llvm-project
index a6f4c1bb07d58..a56b846ec7c96 160000
--- a/src/llvm-project
+++ b/src/llvm-project
@@ -1 +1 @@
-Subproject commit a6f4c1bb07d58df5956d2c49be68547143f77b18
+Subproject commit a56b846ec7c96d8dc86418819baee40d70c92974
diff --git a/src/test/ui/issues/issue-66308.rs b/src/test/ui/issues/issue-66308.rs
new file mode 100644
index 0000000000000..8460b359ae38a
--- /dev/null
+++ b/src/test/ui/issues/issue-66308.rs
@@ -0,0 +1,8 @@
+// build-pass
+// compile-flags: --crate-type lib -C opt-level=0
+
+// Regression test for LLVM crash affecting Emscripten targets
+
+pub fn foo() {
+    (0..0).rev().next();
+}