SpeculativeDevirtualizer: Make sure to link SILFunctions after speculative de-virtualization.

This makes sure that the pass de-serializes all always-emit-into-client functions.

lib/SILOptimizer/Transforms/SpeculativeDevirtualizer.cpp

@@ -618,6 +618,8 @@ namespace {
         Changed |= tryToSpeculateTarget(AI, CHA, ORE);
 
       if (Changed) {
+        CurFn.getModule().linkFunction(&CurFn, SILModule::LinkingMode::LinkAll);
+
         invalidateAnalysis(SILAnalysis::InvalidationKind::FunctionBody);
       }
     }