Revert "[cxx-interop] Temporarily exclude CxxSetToCollection benchmark from the build (swiftlang#81145)"

This reverts commit 86c30d6.

Author: j-hui

benchmark/cxx-source/CxxSetToCollection.swift

@@ -13,8 +13,6 @@
 // This is a benchmark that tracks how quickly Swift can convert a C++ set
 // to a Swift collection.
 
-/* FIXME: rdar://150067288
-
 import TestsUtils
 import CxxStdlibPerformance
 import Cxx
@@ -66,5 +64,3 @@ public func run_CxxSetOfU32_forEach(_ n: Int) {
     }
   }
 }
-
-*/

benchmark/cxx-source/CxxStringConversion.swift

@@ -10,8 +10,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-/* FIXME: rdar://150067288
-
 import TestsUtils
 import CxxStdlibPerformance
 import CxxStdlib
@@ -60,5 +58,3 @@ public func run_cxxToSwift(_ n: Int) {
     blackHole(x)
   }
 }
-
-*/

benchmark/cxx-source/CxxVectorSum.swift

@@ -13,8 +13,6 @@
 // This is a benchmark that tracks how quickly Swift can sum up a C++ vector
 // as compared to the C++ implementation of such sum.
 
-/* FIXME: rdar://150067288
-
 import TestsUtils
 import CxxStdlibPerformance
 import Cxx
@@ -121,5 +119,3 @@ public func run_CxxVectorOfU32_Sum_Swift_Reduce(_ n: Int) {
     }
     blackHole(sum)
 }
-
-*/