[test] Fix usages of std::array initializer lists.

R=clemensh@chromium.org

Change-Id: I49ca12fc882dd19eb26b60ed64a36b023a836702
Reviewed-on: https://chromium-review.googlesource.com/868294Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50626}

test/cctest/compiler/c-signature.h

@@ -53,7 +53,7 @@ class CSignature : public MachineSignature {
   static void VerifyParams(MachineSignature* sig) {
     // Verifies the C signature against the machine types.
     std::array<MachineType, sizeof...(Params)> params{
-        MachineTypeForC<Params>()...};
+        {MachineTypeForC<Params>()...}};
     for (size_t p = 0; p < params.size(); ++p) {
       CHECK_EQ(sig->GetParam(p), params[p]);
     }
@@ -67,7 +67,7 @@ class CSignature : public MachineSignature {
   static CSignature* New(Zone* zone, MachineType ret,
                          ParamMachineTypes... params) {
     constexpr size_t param_count = sizeof...(params);
-    std::array<MachineType, param_count> param_arr{params...};
+    std::array<MachineType, param_count> param_arr{{params...}};
     const size_t buffer_size =
         param_count + (ret == MachineType::None() ? 0 : 1);
     MachineType* buffer = zone->NewArray<MachineType>(buffer_size);

test/cctest/compiler/codegen-tester.h

@@ -88,7 +88,7 @@ class BufferedRawMachineAssemblerTester
         return_parameter_index_(sizeof...(p)) {
     static_assert(sizeof...(p) <= arraysize(parameter_nodes_),
                   "increase parameter_nodes_ array");
-    std::array<MachineType, sizeof...(p)> p_arr{p...};
+    std::array<MachineType, sizeof...(p)> p_arr{{p...}};
     for (size_t i = 0; i < p_arr.size(); ++i) {
       parameter_nodes_[i] = Load(p_arr[i], RawMachineAssembler::Parameter(i));
     }
@@ -144,7 +144,7 @@ class BufferedRawMachineAssemblerTester<void>
                             MachineType::None(), p...)) {
     static_assert(sizeof...(p) <= arraysize(parameter_nodes_),
                   "increase parameter_nodes_ array");
-    std::array<MachineType, sizeof...(p)> p_arr{p...};
+    std::array<MachineType, sizeof...(p)> p_arr{{p...}};
     for (size_t i = 0; i < p_arr.size(); ++i) {
       parameter_nodes_[i] = Load(p_arr[i], RawMachineAssembler::Parameter(i));
     }

test/cctest/compiler/graph-builder-tester.h

@@ -190,7 +190,7 @@ class GraphBuilderTester : public HandleAndZoneScope,
 
   template <typename... NodePtrs>
   Node* NewNode(const Operator* op, NodePtrs... n) {
-    std::array<Node*, sizeof...(n)> inputs{n...};
+    std::array<Node*, sizeof...(n)> inputs{{n...}};
     return MakeNode(op, inputs.size(), inputs.data());
   }