Fix clang errors in ArenaAllocator.

Change-Id: Ib0fa290fd46ff9288f86cda9be2d1c1faf99b964
diff --git a/compiler/utils/arena_allocator.cc b/compiler/utils/arena_allocator.cc
index 365b094..ca4635d 100644
--- a/compiler/utils/arena_allocator.cc
+++ b/compiler/utils/arena_allocator.cc
@@ -31,7 +31,8 @@
 static constexpr size_t kValgrindRedZoneBytes = 8;
 constexpr size_t Arena::kDefaultSize;
 
-static const char* alloc_names[kNumArenaAllocKinds] = {
+template <bool kCount>
+const char* ArenaAllocatorStatsImpl<kCount>::kAllocNames[kNumArenaAllocKinds] = {
   "Misc       ",
   "BasicBlock ",
   "LIR        ",
@@ -94,14 +95,14 @@
   const size_t bytes_allocated = BytesAllocated();
   os << " MEM: used: " << bytes_allocated << ", allocated: " << malloc_bytes
      << ", lost: " << lost_bytes << "\n";
-  size_t num_allocations = ArenaAllocatorStats::NumAllocations();
+  size_t num_allocations = NumAllocations();
   if (num_allocations != 0) {
     os << "Number of arenas allocated: " << num_arenas << ", Number of allocations: "
        << num_allocations << ", avg size: " << bytes_allocated / num_allocations << "\n";
   }
   os << "===== Allocation by kind\n";
   for (int i = 0; i < kNumArenaAllocKinds; i++) {
-      os << alloc_names[i] << std::setw(10) << alloc_stats_[i] << "\n";
+      os << kAllocNames[i] << std::setw(10) << alloc_stats_[i] << "\n";
   }
 }
 
diff --git a/compiler/utils/arena_allocator.h b/compiler/utils/arena_allocator.h
index a6b74f7..18a5bce 100644
--- a/compiler/utils/arena_allocator.h
+++ b/compiler/utils/arena_allocator.h
@@ -90,6 +90,8 @@
   size_t num_allocations_;
   // TODO: Use std::array<size_t, kNumArenaAllocKinds> from C++11 when we upgrade the STL.
   size_t alloc_stats_[kNumArenaAllocKinds];  // Bytes used by various allocation kinds.
+
+  static const char* kAllocNames[kNumArenaAllocKinds];
 };
 
 typedef ArenaAllocatorStatsImpl<kArenaAllocatorCountAllocations> ArenaAllocatorStats;