Merge pull request #6468 from slavapestov/fix-warnings

Fix warnings

Author: slavapestov

lib/SILOptimizer/IPO/DeadFunctionElimination.cpp

@@ -475,7 +475,7 @@ class ExternalFunctionDefinitionsElimination : FunctionLivenessComputation {
 
     // Check witness methods.
     for (SILWitnessTable &WT : Module->getWitnessTableList()) {
-      bool tableIsAlive = isVisibleExternally(WT.getConformance()->getProtocol());
+      isVisibleExternally(WT.getConformance()->getProtocol());
       for (const SILWitnessTable::Entry &entry : WT.getEntries()) {
         if (entry.getKind() != SILWitnessTable::Method)
           continue;

lib/Sema/TypeCheckDecl.cpp

@@ -1573,7 +1573,7 @@ static void checkTypeAccessibility(
                             DowngradeToWarning)> diagnose) {
   const DeclContext *DC = context->getDeclContext();
   bool isParam = false;
-  if (auto *param = dyn_cast<ParamDecl>(context)) {
+  if (isa<ParamDecl>(context)) {
     isParam = true;
     context = dyn_cast<AbstractFunctionDecl>(DC);
     if (!context)