[llvm] [ADT] Add roundUpNumBuckets to DenseMap (NFC) (PR #168301)

[Sergei Barannikov via llvm-commits]

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@@ -556,7 +556,10 @@ class DenseMapBase : public DebugEpochBase {
     return llvm::make_range(getBuckets(), getBucketsEnd());
   }
 
-  void grow(unsigned AtLeast) { derived().grow(AtLeast); }
+  void grow(unsigned NumBuckets) {
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s-barannikov wrote:

(minor nit) The *parameter* is not rounded yet so probably it should keep the original name or MinNumBuckets
If renaming it, might as well inline the rounded variable to avoid introducing a new one

https://github.com/llvm/llvm-project/pull/168301