[llvm] [mlgo][inliner] Fix incorrect state tracking when deferring to the default policy (PR #163477)

[Mircea Trofin via llvm-commits]

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@@ -214,6 +217,8 @@ MLInlineAdvisor::MLInlineAdvisor(
     return;
   }
   ModelRunner->switchContext("");
+  if (StopImmediatelyForTest.getNumOccurrences() > 0)
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mtrofin wrote:

Or just direct assignment. Wanted to deemphasise the flag, but the name says it all.

https://github.com/llvm/llvm-project/pull/163477