[Optimizer] Don't walk from deleted.

During inlining, the apply is deleted.  So when publishing this best
effort list of which instructions were "changed" during inlining, start
from the instruction before the deleted apply.

Author: nate-chandler

SwiftCompilerSources/Sources/Optimizer/PassManager/ContextCommon.swift

@@ -96,6 +96,7 @@ extension MutatingContext {
   func inlineFunction(apply: FullApplySite, mandatoryInline: Bool) {
     // This is only a best-effort attempt to notify the new cloned instructions as changed.
     // TODO: get a list of cloned instructions from the `inlineFunction`
+    let instBeforeInlining = apply.previous
     let instAfterInlining: Instruction?
     switch apply {
     case is ApplyInst:
@@ -111,8 +112,9 @@ extension MutatingContext {
 
     bridgedPassContext.inlineFunction(apply.bridged, mandatoryInline)
 
-    if let instAfterInlining = instAfterInlining {
-      notifyNewInstructions(from: apply, to: instAfterInlining)
+    if let instBeforeInlining = instBeforeInlining?.next,
+       let instAfterInlining = instAfterInlining {
+      notifyNewInstructions(from: instBeforeInlining, to: instAfterInlining)
     }
   }