Index: llvm/include/llvm/Support/Allocator.h
===================================================================
--- llvm/include/llvm/Support/Allocator.h
+++ llvm/include/llvm/Support/Allocator.h
@@ -137,10 +137,10 @@
 /// object, which wraps malloc, to allocate memory, but it can be changed to
 /// use a custom allocator.
 template <typename AllocatorT = MallocAllocator, size_t SlabSize = 4096,
-          size_t SizeThreshold = SlabSize>
+          size_t SizeThreshold = SlabSize, size_t SlabSizeGrowCount = 128>
 class BumpPtrAllocatorImpl
-    : public AllocatorBase<
-          BumpPtrAllocatorImpl<AllocatorT, SlabSize, SizeThreshold>> {
+    : public AllocatorBase<BumpPtrAllocatorImpl<
+          AllocatorT, SlabSize, SizeThreshold, SlabSizeGrowCount>> {
 public:
   static_assert(SizeThreshold <= SlabSize,
                 "The SizeThreshold must be at most the SlabSize to ensure "
@@ -391,10 +391,11 @@
 
   static size_t computeSlabSize(unsigned SlabIdx) {
     // Scale the actual allocated slab size based on the number of slabs
-    // allocated. Every 128 slabs allocated, we double the allocated size to
-    // reduce allocation frequency, but saturate at multiplying the slab size by
-    // 2^30.
-    return SlabSize * ((size_t)1 << std::min<size_t>(30, SlabIdx / 128));
+    // allocated. Every SlabSizeGrowCount slabs allocated, we double the
+    // allocated size to reduce allocation frequency, but saturate at
+    // multiplying the slab size by 2^30.
+    return SlabSize *
+           ((size_t)1 << std::min<size_t>(30, SlabIdx / SlabSizeGrowCount));
   }
 
   /// Allocate a new slab and move the bump pointers over into the new