[Swift Export] Use ExportedBridge instead of ExportForCppRuntime

ExportedBridge annotation actually does what we need in Swift Export.
Unlike ExportForCppRuntime, it prevents symbol from DCE.

native/swift/sir-compiler-bridge/testData/primitive_parameters/expected.kt

@@ -1,18 +1,18 @@
-import kotlin.native.internal.ExportForCppRuntime
+import kotlin.native.internal.ExportedBridge
 
-@ExportForCppRuntime("a")
+@ExportedBridge("a")
 public fun a(p0: Byte, p1: Short, p2: Int, p3: Long): Int {
     val result = pkg.a(p0, p1, p2, p3)
     return result
 }
 
-@ExportForCppRuntime("b")
+@ExportedBridge("b")
 public fun b(p0: UByte, p1: UShort, p2: UInt, p3: ULong): UInt {
     val result = pkg.b(p0, p1, p2, p3)
     return result
 }
 
-@ExportForCppRuntime("c")
+@ExportedBridge("c")
 public fun c(p0: Boolean): Boolean {
     val result = pkg.c(p0)
     return result