Merge pull request swiftlang#12350 from compnerd/calling-conv

stdlib: fix build for non-ObjC targets

Author: compnerd

stdlib/public/core/RuntimeFunctionCounters.swift

@@ -91,8 +91,13 @@ internal func _collectAllReferencesInsideObjectImpl(
 // of runtime function counters.
 public // @testable
 struct _RuntimeFunctionCounters {
+#if os(Windows) && arch(x86_64)
   public typealias RuntimeFunctionCountersUpdateHandler =
-   @convention(c) (_ object: UnsafeRawPointer, _ functionId: Int64) -> Void
+    @convention(c) (_ object: UnsafeRawPointer, _ functionId: Int) -> Void
+#else
+  public typealias RuntimeFunctionCountersUpdateHandler =
+    @convention(c) (_ object: UnsafeRawPointer, _ functionId: Int64) -> Void
+#endif
 
   public static let runtimeFunctionNames =
     getRuntimeFunctionNames()