Rollup merge of #133104 - matthiaskrgr:crashtest_debugass_131451.rs, r=saethlin

crashes: add test for #131451

r? `@saethlin`
How do I find out which mir opts are involved here? 😅

Author: matthiaskrgr

tests/crashes/131451.rs

@@ -0,0 +1,9 @@
+//@ known-bug: #131451
+//@ needs-rustc-debug-assertions
+//@ compile-flags: -Zmir-enable-passes=+GVN -Zmir-enable-passes=+JumpThreading --crate-type=lib
+
+pub fn fun(terminate: bool) {
+    while true {}
+
+    while !terminate {}
+}