Fix release build warnings about uninitialized variables.

Author: rudkx

lib/AST/ASTContext.cpp

@@ -1210,6 +1210,7 @@ ASTContext::createTrivialSubstitutions(BoundGenericType *BGT,
   assert(Params.size() == 1);
   auto Param = Params[0];
   assert(Param->getArchetype() && "Not type-checked yet");
+  (void) Param;
   Substitution Subst(BGT->getGenericArgs()[0], {});
   auto Substitutions = AllocateCopy(llvm::makeArrayRef(Subst));
   auto arena = getArena(BGT->getRecursiveProperties());

lib/SIL/Projection.cpp

@@ -98,6 +98,7 @@ NewProjection::NewProjection(SILInstruction *I) : Value() {
     assert(getIndex() == 0);
     assert(getType(PBI->getOperand().getType(), PBI->getModule()) ==
            PBI->getType());
+    (void) PBI;
     break;
   }
   case ValueKind::TupleExtractInst: {
@@ -311,6 +312,7 @@ void NewProjection::getFirstLevelProjections(
           assert(X.getMostDerivedType(Mod) == SILType::getPrimitiveAddressType(
                                                 Box->getBoxedType()));
           X.verify(Mod););
+    (void) Box;
     Out.push_back(P);
     return;
   }

lib/SILGen/SILGenDynamicCast.cpp

@@ -329,6 +329,7 @@ static RValue emitCollectionDowncastExpr(SILGenFunction &SGF,
   auto toSubsts = toCollection->getSubstitutions(SGF.SGM.SwiftModule,nullptr);
   assert(fnArcheTypes.size() == fromSubsts.size() + toSubsts.size() &&
          "wrong number of generic collection parameters");
+  (void) fnArcheTypes;
 
   // Form type parameter substitutions.
   SmallVector<Substitution, 4> subs;

lib/SILGen/SILGenExpr.cpp

@@ -1089,6 +1089,7 @@ visitCollectionUpcastConversionExpr(CollectionUpcastConversionExpr *E,
   auto toSubsts = toCollection->getSubstitutions(SGF.SGM.SwiftModule,nullptr);
   assert(fnArcheTypes.size() == fromSubsts.size() + toSubsts.size() &&
          "wrong number of generic collection parameters");
+  (void) fnArcheTypes;
 
   // Form type parameter substitutions.
   SmallVector<Substitution, 4> subs;

lib/SILOptimizer/LoopTransforms/LoopRotate.cpp

@@ -113,9 +113,7 @@ updateSSAForUseOfInst(SILSSAUpdater &Updater,
   // Find the mapped instruction.
   assert(ValueMap.count(Inst) && "Expected to find value in map!");
   SILValue MappedValue = ValueMap.find(Inst)->second;
-  auto *MappedInst = MappedValue.getDef();
   assert(MappedValue);
-  assert(MappedInst);
 
   // For each use of a specific result value of the instruction.
   if (Inst->hasValue()) {