Auto merge of #95893 - luqmana:no-prepopulate-passes-tweaks, r=nikic

Respect -Z verify-llvm-ir and other flags that add extra passes when combined with -C no-prepopulate-passes in the new LLVM Pass Manager.

As part of the switch to the new LLVM Pass Manager the behaviour of flags such as `-Z verify-llvm-ir` (e.g. sanitizer, instrumentation) was modified when combined with `-C no-prepopulate-passes`. With the old PM, rustc was the one manually constructing the pipeline and respected those flags but in the new pass manager, those flags are used to build a list of callbacks that get invoked at certain extension points in the pipeline. Unfortunately, `-C no-prepopulate-passes` would skip building the pipeline altogether meaning we'd never add the corresponding passes. The fix here is to just manually invoke those callbacks as needed.

Fixes #95874

Demonstrating the current vs fixed behaviour using the bug in #95864
```console
$ rustc +nightly asm-miscompile.rs --edition 2021 --emit=llvm-ir -C no-prepopulate-passes -Z verify-llvm-ir
$ echo $?
0
$ rustc +stage1 asm-miscompile.rs --edition 2021 --emit=llvm-ir -C no-prepopulate-passes -Z verify-llvm-ir
Basic Block in function '_ZN14asm_miscompile3foo28_$u7b$$u7b$closure$u7d$$u7d$17h360e2f7eee1275c5E' does not have terminator!
label %bb1
LLVM ERROR: Broken module found, compilation aborted!
```

compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp

@@ -995,6 +995,13 @@ LLVMRustOptimizeWithNewPassManager(
         break;
       }
     }
+  } else {
+    // We're not building any of the default pipelines but we still want to
+    // add the verifier, instrumentation, etc passes if they were requested
+    for (const auto &C : PipelineStartEPCallbacks)
+      C(MPM, OptLevel);
+    for (const auto &C : OptimizerLastEPCallbacks)
+      C(MPM, OptLevel);
   }
 
   if (ExtraPassesLen) {