Get rid of helper function

benchmark/single-source/StringRepeating.swift

@@ -27,39 +27,33 @@ public let benchmarks = [
                 tags: [.validation, .api, .String])
 ]
 
-@inline(never)
-func repeating(_ i: String, count: Int) -> String {
-  let s = String(repeating: getString(i), count: count)
-  return s
-}
-
 @inline(never)
 public func run_singleAsciiCharacterCount100(N: Int) {
+  let string = getString("x")
   for _ in 1...5000*N {
-    blackHole(repeating("x", count: 100))
+    blackHole(String(repeating: string, count: 100))
   }
 }
 
 @inline(never)
 public func run_26AsciiCharactersCount2(N: Int) {
+  let string = getString("abcdefghijklmnopqrstuvwxyz")
   for _ in 1...5000*N {
-    blackHole(repeating("abcdefghijklmnopqrstuvwxyz", count: 2))
+    blackHole(String(repeating: string, count: 2))
   }
 }
 
 @inline(never)
 public func run_33CyrillicCharactersCount2(N: Int) {
+  let string = getString("абвгґдеєжзиіїйклмнопрстуфхцчшщьюя")
   for _ in 1...5000*N {
-    blackHole(repeating("абвгґдеєжзиіїйклмнопрстуфхцчшщьюя", count: 2))
+    blackHole(String(repeating: string, count: 2))
   }
 }
 
 @inline(never)
 public func run_longMixedStringCount100(N: Int) {
-  for _ in 1...5000*N {
-    blackHole(
-      repeating(
-        """
+  let string = """
     Swift is a multi-paradigm, compiled programming language created for
     iOS, OS X, watchOS, tvOS and Linux development by Apple Inc. Swift is
     designed to work with Apple's Cocoa and Cocoa Touch frameworks and the
@@ -75,9 +69,8 @@ public func run_longMixedStringCount100(N: Int) {
     日本語の場合はランダムに生成された文章以外に、
     著作権が切れた小説などが利用されることもある。
     🦩
-        """,
-        count: 100
-      )
-    )
+    """
+  for _ in 1...5000*N {
+    blackHole(String(repeating: string, count: 100))
   }
 }