Rollup merge of #150210 - Enselic:run-mir-pass, r=saethlin

tests/debuginfo/function-arg-initialization.rs: Stop disabling SingleUseConsts MIR pass

This test passes locally for me. Let's see if it passes CI too.

Discovered while I worked on #150201.

CC #128945

Author: JonathanBrouwer

tests/debuginfo/function-arg-initialization.rs

@@ -6,8 +6,7 @@
 // function name.
 
 //@ min-lldb-version: 1800
-//@ compile-flags:-g -Zmir-enable-passes=-SingleUseConsts
-// SingleUseConsts shouldn't need to be disabled, see #128945
+//@ compile-flags:-g
 //@ disable-gdb-pretty-printers
 //@ ignore-backends: gcc