Bug 1841082: Don't unlink empty IC chain r=jandem

Differential Revision: https://phabricator.services.mozilla.com/D182530

Author: iainireland

js/src/jit/WarpOracle.cpp

@@ -1032,7 +1032,9 @@ AbortReasonOr<bool> WarpScriptOracle::maybeInlineCall(
         // If the target script can't be warp-compiled, mark it as
         // uninlineable, clean up, and fall through to the non-inlined path.
         ICEntry* entry = icScript_->icEntryForStub(fallbackStub);
-        fallbackStub->unlinkStub(cx_->zone(), entry, /*prev=*/nullptr, stub);
+        if (entry->firstStub() == stub) {
+          fallbackStub->unlinkStub(cx_->zone(), entry, /*prev=*/nullptr, stub);
+        }
         targetScript->setUninlineable();
         info_->inlineScriptTree()->removeCallee(inlineScriptTree);
         if (isTrialInlined) {