Add swift-async-frame-pointer=never when relative protocol witness tables is on

Building a static library in debug does not work when using
swift-async-frame-pointer.

Author: aschwaighofer

stdlib/cmake/modules/SwiftSource.cmake

@@ -570,6 +570,7 @@ function(_compile_swift_files
 
   if (SWIFT_STDLIB_USE_RELATIVE_PROTOCOL_WITNESS_TABLES)
     list(APPEND swift_flags "-Xfrontend" "-enable-relative-protocol-witness-tables")
+    list(APPEND swift_flags "-Xfrontend" "-swift-async-frame-pointer=never")
   endif()
 
   if(SWIFT_STDLIB_DISABLE_INSTANTIATION_CACHES)

test/lit.cfg

@@ -1013,7 +1013,7 @@ if run_vendor == 'apple':
             swift_execution_tests_extra_flags += ' -Xfrontend -reflection-metadata-for-debugger-only'
 
         if config.swift_stdlib_use_relative_protocol_witness_tables:
-            swift_execution_tests_extra_flags += ' -Xfrontend -enable-relative-protocol-witness-tables'
+            swift_execution_tests_extra_flags += ' -Xfrontend -enable-relative-protocol-witness-tables -Xfrontend -swift-async-frame-pointer=never'
 
         # Build a resource dir for freestanding tests.
         new_resource_dir = os.path.join(config.test_exec_root, "resource_dir")