[benchmark] ArraySetElement - revert legacy factor

This benchmark had good enough runtime with the original 10x loop multiplier. Lowering it further exposed the setup overhead of creating the 10k element array. Reverting back.

Author: palimondo

benchmark/single-source/ArraySetElement.swift

@@ -18,8 +18,7 @@ import TestsUtils
 public var ArraySetElement = BenchmarkInfo(
   name: "ArraySetElement",
   runFunction: run_ArraySetElement,
-  tags: [.runtime, .cpubench, .unstable],
-  legacyFactor: 10
+  tags: [.runtime, .cpubench]
 )
 
 // This is an effort to defeat isUniquelyReferenced optimization. Ideally
@@ -31,7 +30,7 @@ func storeArrayElement(_ array: inout [Int], _ i: Int) {
 
 public func run_ArraySetElement(_ N: Int) {
   var array = [Int](repeating: 0, count: 10000)
-  for _ in 0..<N {
+  for _ in 0..<10*N {
     for i in 0..<array.count {
       storeArrayElement(&array, i)
     }