Don’t disable Swift 6 mode in swift-syntax (#7545)

This shouldn’t be needed anymore with
#7504.

Author: ahoppen

Utilities/bootstrap

@@ -747,8 +747,6 @@ def get_swiftpm_env_cmd(args):
         env_cmd.append("SWIFTPM_LLBUILD_FWK=1")
     env_cmd.append("SWIFTCI_USE_LOCAL_DEPS=1")
     env_cmd.append("SWIFTPM_MACOS_DEPLOYMENT_TARGET=%s" % g_macos_deployment_target)
-    # Disable Swift 6 mode in swift-syntax to work around rdar://126952308
-    env_cmd.append("SWIFTSYNTAX_DISABLE_SWIFT_6_MODE=1")
 
     if not '-macosx' in args.build_target and args.command == 'install':
         env_cmd.append("SWIFTCI_INSTALL_RPATH_OS=%s" % args.platform_path.group(2))

Utilities/build-using-self

@@ -20,8 +20,6 @@ echo "Current directory is ${PWD}"
 
 CONFIGURATION=debug
 export SWIFTCI_IS_SELF_HOSTED=1
-# Disable Swift 6 mode in swift-syntax to work around rdar://126952308
-export SWIFTSYNTAX_DISABLE_SWIFT_6_MODE=1
 
 set -x