[Axccel] Remove -Wno-missing-braces in build

Summary:
I originally added the -Wno-missing-braces flag because I thought it was
erroneously flagging std::array initializations. Now I realize the extra
braces really are desired for these initializations, so I'm turning the
warning flag back on.

Reviewers: jlebar

Subscribers: mgorny, parallel_libs-commits

Differential Revision: https://reviews.llvm.org/D27941

llvm-svn: 290137
diff --git a/parallel-libs/acxxel/examples/opencl_example.cpp b/parallel-libs/acxxel/examples/opencl_example.cpp
index 713daac..4e3cf07 100644
--- a/parallel-libs/acxxel/examples/opencl_example.cpp
+++ b/parallel-libs/acxxel/examples/opencl_example.cpp
@@ -57,9 +57,9 @@
 
 int main() {
   float A = 2.f;
-  std::array<float, 3> X = {0.f, 1.f, 2.f};
-  std::array<float, 3> Y = {3.f, 4.f, 5.f};
-  std::array<float, 3> Expected = {3.f, 6.f, 9.f};
+  std::array<float, 3> X{{0.f, 1.f, 2.f}};
+  std::array<float, 3> Y{{3.f, 4.f, 5.f}};
+  std::array<float, 3> Expected{{3.f, 6.f, 9.f}};
   saxpy(A, X, Y);
   for (int I = 0; I < 3; ++I)
     if (X[I] != Expected[I]) {