Fix multicast delegate step from delegate (#17990)

- Replace incorrect FEATURE_STUBS_AS_IL define check with FEATURE_MULTICASTSTUB_AS_IL
  - Allows step from one delegate to the next and step out from multicast delegate to function correctly.
- Add null check as the active frame's methoddesc isn't always non-null
  - In scenarios such as FuncEval, we also run through this code, and the md may be null.
- Fix unwind from StubHelpers::MulticastDebuggerTraceHelper function on amd64

1 files changed, 1 insertions, 1 deletions

diff --git a/src/debug/ee/frameinfo.cpp b/src/debug/ee/frameinfo.cpp
index fb9ea886bf..0387ca9217 100644
--- a/src/debug/ee/frameinfo.cpp
+++ b/src/debug/ee/frameinfo.cpp
@@ -1563,7 +1563,7 @@ StackWalkAction DebuggerWalkStackProc(CrawlFrame *pCF, void *data)
     // The only exception is dynamic methods.  We want to report them when SIS is turned on.
     if ((md != NULL) && md->IsILStub() && pCF->IsFrameless())
     {
-#ifdef FEATURE_STUBS_AS_IL
+#ifdef FEATURE_MULTICASTSTUB_AS_IL
         if(md->AsDynamicMethodDesc()->IsMulticastStub())
         {
             use = true;