Merge pull request swiftlang#25765 from Catfish-Man/bridged-normalization-bench

Add a benchmark for unicode Strings created via JSON decoding

Author: Catfish-Man

benchmark/single-source/ObjectiveCBridging.swift

@@ -76,6 +76,9 @@ public let ObjectiveCBridging = [
   BenchmarkInfo(name: "ObjectiveCBridgeASCIIStringFromFile",
                 runFunction: run_ASCIIStringFromFile, tags: ts,
                 setUpFunction: setup_ASCIIStringFromFile),
+  BenchmarkInfo(name: "UnicodeStringFromCodable",
+                 runFunction: run_UnicodeStringFromCodable, tags: ts,
+                 setUpFunction: setup_UnicodeStringFromCodable),
 ]
 
 #if _runtime(_ObjC)
@@ -744,3 +747,25 @@ public func run_ASCIIStringFromFile(_ N: Int) {
   #endif
 }
 
+var unicodeStringFromCodable:String? = nil
+var unicodeStringFromCodableDict = [String:Void]()
+public func setup_UnicodeStringFromCodable() {
+  let jsonString = "[\(String(reflecting: string))]"
+
+   let decoded = try JSONDecoder().decode([String].self, from: Data(jsonString.utf8))
+   let reEncoded = try JSONEncoder().encode(decoded)
+   let desc = try JSONDecoder().decode([String].self, from: reEncoded)
+
+   unicodeStringFromCodable = desc[0]
+}
+
+@inline(never)
+public func run_UnicodeStringFromCodable(_ N: Int) {
+  #if _runtime(_ObjC)
+  for _ in 0 ..< N {
+    for _ in 0..<100 {
+      unicodeStringFromCodableDict[identity(unicodeStringFromCodable)] = ()
+    }
+  }
+  #endif
+}