ignore-debug: debug assertions in slice indexing prevent the optimization

Author: erikdesjardins

src/test/codegen/issue-69101-bounds-check.rs

@@ -1,5 +1,6 @@
 // no-system-llvm
 // compile-flags: -O
+// ignore-debug: the debug assertions get in the way
 #![crate_type = "lib"]
 
 // Make sure no bounds checks are emitted in the loop when upfront slicing