Wasm: update stack size linker options in tests

Adjust `SwiftDriverTests/testLinking` for correct CLI options format.

Author: MaxDesiatov

Tests/SwiftDriverTests/SwiftDriverTests.swift

@@ -2766,7 +2766,7 @@ final class SwiftDriverTests: XCTestCase {
         XCTAssertTrue(cmd.contains(.responseFilePath(.absolute(path.appending(components: "wasi", "static-executable-args.lnk")))))
         XCTAssertTrue(cmd.contains(subsequence: [.flag("-Xlinker"), .flag("--global-base=4096")]))
         XCTAssertTrue(cmd.contains(subsequence: [.flag("-Xlinker"), .flag("--table-base=4096")]))
-        XCTAssertTrue(cmd.contains(subsequence: [.flag("-Xlinker"), .flag("--stack-size=\(128 * 1024)")]))
+        XCTAssertTrue(cmd.contains(subsequence: [.flag("-Xlinker"), .flag("-z"), .flag("stack-size=\(128 * 1024)")]))
         XCTAssertTrue(cmd.contains(.flag("-O3")))
         XCTAssertEqual(linkJob.outputs[0].file, try toPath("Test"))