Only import SwiftShims if we're going to use MetadataSections

Author: grynspan

Sources/Testing/Discovery+Platform.swift

@@ -9,7 +9,6 @@
 //
 
 internal import _TestingInternals
-private import SwiftShims
 
 /// A structure describing the bounds of a Swift metadata section.
 struct SectionBounds: Sendable {
@@ -89,6 +88,8 @@ private func _testContentSectionBounds() -> [SectionBounds] {
 #elseif os(Linux) || os(FreeBSD) || os(Android)
 // MARK: - ELF implementation
 
+private import SwiftShims // For MetadataSections
+
 /// The ELF-specific implementation of ``SectionBounds/all``.
 ///
 /// - Returns: An array of structures describing the bounds of all known test