[ADT] Make DenseMap::init() private (NFC) (llvm#134229)

I believe this method was not supposed to be public, as it has
additional preconditions (it will misbehave when called on a non-empty
DenseMap).

The public API for this is reserve().

Author: nikic

llvm/include/llvm/ADT/DenseMap.h

@@ -806,16 +806,6 @@ class DenseMap : public DenseMapBase<DenseMap<KeyT, ValueT, KeyInfoT, BucketT>,
     }
   }
 
-  void init(unsigned InitNumEntries) {
-    auto InitBuckets = BaseT::getMinBucketToReserveForEntries(InitNumEntries);
-    if (allocateBuckets(InitBuckets)) {
-      this->BaseT::initEmpty();
-    } else {
-      NumEntries = 0;
-      NumTombstones = 0;
-    }
-  }
-
   void grow(unsigned AtLeast) {
     unsigned OldNumBuckets = NumBuckets;
     BucketT *OldBuckets = Buckets;
@@ -878,6 +868,16 @@ class DenseMap : public DenseMapBase<DenseMap<KeyT, ValueT, KeyInfoT, BucketT>,
         allocate_buffer(sizeof(BucketT) * NumBuckets, alignof(BucketT)));
     return true;
   }
+
+  void init(unsigned InitNumEntries) {
+    auto InitBuckets = BaseT::getMinBucketToReserveForEntries(InitNumEntries);
+    if (allocateBuckets(InitBuckets)) {
+      this->BaseT::initEmpty();
+    } else {
+      NumEntries = 0;
+      NumTombstones = 0;
+    }
+  }
 };
 
 template <typename KeyT, typename ValueT, unsigned InlineBuckets = 4,

llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp

@@ -897,8 +897,8 @@ class MemLocFragmentFill {
         Worklist.push(RPONumber);
         ++RPONumber;
       }
-      LiveIn.init(RPONumber);
-      LiveOut.init(RPONumber);
+      LiveIn.reserve(RPONumber);
+      LiveOut.reserve(RPONumber);
     }
 
     // Perform the traversal.
@@ -2318,8 +2318,8 @@ bool AssignmentTrackingLowering::run(FunctionVarLocsBuilder *FnVarLocsBuilder) {
       Worklist.push(RPONumber);
       ++RPONumber;
     }
-    LiveIn.init(RPONumber);
-    LiveOut.init(RPONumber);
+    LiveIn.reserve(RPONumber);
+    LiveOut.reserve(RPONumber);
   }
 
   // Perform the traversal.