Enable concurrency back deployment in CI configurations.

Author: DougGregor

utils/build-presets.ini

@@ -14,10 +14,10 @@
 # Buildbots for Darwin OSes
 #===------------------------------------------------------------------------===#
 [preset: mixin_buildbot_install_components]
-swift-install-components=compiler;clang-builtin-headers;stdlib;sdk-overlay;parser-lib;editor-integration;tools;toolchain-tools;testsuite-tools;sourcekit-xpc-service;swift-remote-mirror;swift-remote-mirror-headers;
+swift-install-components=back-deployment;compiler;clang-builtin-headers;stdlib;sdk-overlay;parser-lib;editor-integration;tools;toolchain-tools;testsuite-tools;sourcekit-xpc-service;swift-remote-mirror;swift-remote-mirror-headers;
 
 [preset: mixin_buildbot_install_components_with_clang]
-swift-install-components=compiler;clang-resource-dir-symlink;stdlib;sdk-overlay;parser-lib;toolchain-tools;license;sourcekit-xpc-service;swift-remote-mirror;swift-remote-mirror-headers
+swift-install-components=back-deployment;compiler;clang-resource-dir-symlink;stdlib;sdk-overlay;parser-lib;toolchain-tools;license;sourcekit-xpc-service;swift-remote-mirror;swift-remote-mirror-headers
 llvm-install-components=llvm-cov;llvm-profdata;IndexStore;clang;clang-resource-headers;compiler-rt;clangd;dsymutil
 
 [preset: mixin_buildbot_trunk_base]
@@ -40,6 +40,9 @@ install-swift
 
 skip-test-cmark
 
+# Build concurrency back-deployment binaries
+back-deploy-concurrency
+
 # Path to the root of the installation filesystem.
 install-destdir=%(install_destdir)s
 
@@ -1198,6 +1201,9 @@ libcxx
 indexstore-db
 sourcekit-lsp
 
+# Build concurrency back-deployment binaries
+back-deploy-concurrency
+
 # Don't generate the SwiftSyntax gyb files. Instead verify that up-to-date ones
 # are checked in.
 swiftsyntax-verify-generated-files
@@ -2490,6 +2496,7 @@ build-subdir=compat_macos
 ios
 tvos
 watchos
+back-deploy-concurrency
 compiler-vendor=apple
 darwin-install-extract-symbols
 darwin-toolchain-alias=swift
@@ -2499,7 +2506,7 @@ darwin-toolchain-display-name=Swift Development Snapshot
 darwin-toolchain-name=swift-DEVELOPMENT-SNAPSHOT
 darwin-toolchain-version=3.999.999
 llvm-install-components=libclang;libclang-headers;dsymutil
-swift-install-components=compiler;clang-builtin-headers;stdlib;sdk-overlay;license;sourcekit-xpc-service;swift-remote-mirror;swift-remote-mirror-headers
+swift-install-components=back-deployment;compiler;clang-builtin-headers;stdlib;sdk-overlay;license;sourcekit-xpc-service;swift-remote-mirror;swift-remote-mirror-headers
 symbols-package=%(symbols_package)s
 install-symroot=%(install_symroot)s