[Gardening] Silence needless double-brace-initialization warnings

See also https://wg21.cmeerw.net/cwg/issue1270

Author: CodaFi

lib/IRGen/GenType.cpp

@@ -440,7 +440,7 @@ static void emitSpecializedMemOperation(
   auto &Builder = IGF.Builder;
 
   // Sizes to try. Tested in order.
-  const auto sizes = std::array<Size, 4>{
+  const std::array<Size, 4> sizes = {
     Size(0),
     Size(1),
     Size(2),

lib/IRGen/MetadataRequest.cpp

@@ -1935,7 +1935,7 @@ MetadataResponse irgen::emitGenericTypeMetadataAccessFunction(
       ? IGF.Builder.CreateBitCast(params.claimNext(), IGM.Int8PtrTy)
       : llvm::UndefValue::get(IGM.Int8PtrTy);
 
-    std::array<llvm::Value *, 3> argValues{arg0, arg1, arg2};
+    std::array<llvm::Value *, 3> argValues = {arg0, arg1, arg2};
 
     emitCanonicalSpecializationsForGenericTypeMetadataAccessFunction(
         IGF, params, nominal, genericArgs,