Merge pull request #3723 from rudkx/silence-release-build-warnings

Silence a few release-build warnings.

Author: gottesmm

lib/LLVMPasses/LLVMMergeFunctions.cpp

@@ -2152,6 +2152,7 @@ bool SwiftMergeFunctions::replaceDirectCallers(Function *Old, Function *New,
     IRBuilder<> Builder(CI);
 
     FunctionType *NewFuncTy = New->getFunctionType();
+    (void) NewFuncTy;
     unsigned ParamIdx = 0;
 
     // Add the existing parameters.

lib/SILOptimizer/ARC/ARCRegionState.cpp

@@ -474,6 +474,7 @@ bool ARCRegionState::processLoopTopDown(
   }
 
   auto *PredRegion = LRFI->getRegion(*R->pred_begin());
+  (void) PredRegion;
   assert(PredRegion->isBlock() && "Expected the predecessor region to be a "
                                   "block");
 

lib/Sema/TypeCheckDecl.cpp

@@ -6636,6 +6636,7 @@ void TypeChecker::validateDecl(ValueDecl *D, bool resolveTypeParams) {
 
     // Validate the generic type signature, which is just <Self : P>.
     auto gp = proto->getGenericParams();
+    (void) gp;
 
     validateGenericTypeSignature(proto);