stdlib: make the argument label in _UnsafeBitMap.sizeInWords more clear to avoid bits vs. bytes vs. words confusion

Author: gribozavr

stdlib/public/core/HashedCollections.swift.gyb

@@ -2490,7 +2490,7 @@ final internal class _Native${Self}StorageImpl<${TypeParameters}> :
   /// Returns the bytes necessary to store a bit map of 'capacity' bytes and
   /// padding to align the start to word alignment.
   internal static func bytesForBitMap(capacity: Int) -> Int {
-    let numWords = _UnsafeBitMap.sizeInWords(forCapacity: capacity)
+    let numWords = _UnsafeBitMap.sizeInWords(forSizeInBits: capacity)
     return numWords * strideof(UInt) + alignof(UInt)
   }
 
@@ -2554,7 +2554,9 @@ final internal class _Native${Self}StorageImpl<${TypeParameters}> :
 
   internal var _keys: UnsafeMutablePointer<Key> {
     let bitMapSizeInBytes =
-      _unsafeMultiply(_UnsafeBitMap.sizeInWords(forCapacity: _capacity), strideof(UInt))
+      _unsafeMultiply(
+        _UnsafeBitMap.sizeInWords(forSizeInBits: _capacity),
+        strideof(UInt))
     let start =
       UnsafeMutablePointer<UInt8>(_initializedHashtableEntriesBitMapStorage)
       + bitMapSizeInBytes

stdlib/public/core/UnsafeBitMap.swift

@@ -27,7 +27,7 @@ internal struct _UnsafeBitMap {
     return UInt(bitPattern: i) % UInt(UInt._sizeInBits)
   }
 
-  internal static func sizeInWords(forCapacity bitCount: Int) -> Int {
+  internal static func sizeInWords(forSizeInBits bitCount: Int) -> Int {
     return bitCount + Int._sizeInBytes - 1 / Int._sizeInBytes
   }
 
@@ -37,7 +37,7 @@ internal struct _UnsafeBitMap {
   }
 
   internal var numberOfWords: Int {
-    return _UnsafeBitMap.sizeInWords(forCapacity: bitCount)
+    return _UnsafeBitMap.sizeInWords(forSizeInBits: bitCount)
   }
 
   internal func initializeToZero() {