Add -experimental-skip-non-exportable-decls to lazy typechecking emit module jobs.

Resolves rdar://115731361

Author: tshortli

Sources/SwiftDriver/Jobs/EmitModuleJob.swift

@@ -85,6 +85,11 @@ extension Driver {
 
  commandLine.appendFlags("-frontend", "-emit-module", "-experimental-skip-non-inlinable-function-bodies-without-types")
 
+ if parsedOptions.hasArgument(.experimentalLazyTypecheck) {
+ commandLine.appendFlag("-experimental-lazy-typecheck")
+ commandLine.appendFlag("-experimental-skip-non-exportable-decls")
+ }
+
  // Add the inputs.
  for input in self.inputFiles where input.type.isPartOfSwiftCompilation {
  commandLine.append(.path(input.file))
@@ -103,9 +108,6 @@ extension Driver {
  try addCommonSymbolGraphOptions(commandLine: &commandLine)
 
  try commandLine.appendLast(.checkApiAvailabilityOnly, from: &parsedOptions)
- if isFrontendArgSupported(.experimentalLazyTypecheck) {
- try commandLine.appendLast(.experimentalLazyTypecheck, from: &parsedOptions)
- }
 
  if parsedOptions.hasArgument(.parseAsLibrary, .emitLibrary) {
  commandLine.appendFlag(.parseAsLibrary)

Tests/SwiftDriverTests/SwiftDriverTests.swift

@@ -7221,12 +7221,10 @@ final class SwiftDriverTests: XCTestCase {
  var driver = try Driver(args: [
  "swiftc", "test.swift", "-module-name", "Test", "-experimental-lazy-typecheck", "-emit-module-interface"
  ])
- guard driver.isFrontendArgSupported(.experimentalLazyTypecheck) else {
- throw XCTSkip("Skipping: compiler does not support '-experimental-lazy-typecheck'")
- }
  let jobs = try driver.planBuild().removingAutolinkExtractJobs()
  let emitModuleJob = try XCTUnwrap(jobs.first(where: {$0.kind == .emitModule}))
  XCTAssertTrue(emitModuleJob.commandLine.contains(.flag("-experimental-lazy-typecheck")))
+ XCTAssertTrue(emitModuleJob.commandLine.contains(.flag("-experimental-skip-non-exportable-decls")))
  }
 
  func testEmitAPIDescriptorEmitModule() throws {