BumpPtrAllocator: Have the DefaultSlabAllocator created at runtime, not initialization time. This removes one of the 'init_constructors' reported in <rdar://problem/7545356>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93581 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/Allocator.cpp

@@ -142,8 +142,10 @@ void BumpPtrAllocator::PrintStats() const {
          << " (includes alignment, etc)\n";
 }
 
-MallocSlabAllocator BumpPtrAllocator::DefaultSlabAllocator =
-  MallocSlabAllocator();
+MallocSlabAllocator &BumpPtrAllocator::GetDefaultSlabAllocator() {
+  static MallocSlabAllocator DefaultSlabAllocator;
+  return DefaultSlabAllocator;
+}
 
 SlabAllocator::~SlabAllocator() { }