[Build] Make sure to install SwiftSyntax into the toolchain

... otherwise we build a broken compiler in the toolchain, because the
shared libraries for SwiftSyntax aren't present.

Author: DougGregor

utils/build-presets.ini

@@ -38,6 +38,7 @@ build-swift-stdlib-unittest-extra
 
 install-llvm
 install-swift
+install-swiftsyntax
 
 skip-test-cmark
 
@@ -384,6 +385,7 @@ install-swift
 install-llbuild
 install-swiftpm
 install-swift-driver
+install-swiftsyntax
 install-libcxx
 
 [preset: buildbot_incremental,tools=RA,stdlib=RA,apple_silicon]
@@ -818,6 +820,7 @@ install-lldb
 install-llbuild
 install-swiftpm
 install-swift-driver
+install-swiftsyntax
 install-xctest
 install-libicu
 install-prefix=/usr
@@ -948,6 +951,7 @@ host-test
 install-prefix=/usr
 install-llvm
 install-swift
+install-swiftsyntax
 
 skip-test-linux
 skip-build-benchmarks
@@ -1058,6 +1062,7 @@ install-llbuild
 install-foundation
 install-swiftpm
 install-swift-driver
+install-swiftsyntax
 install-xctest
 install-prefix=/usr
 swift-install-components=autolink-driver;compiler;clang-builtin-headers;stdlib;swift-remote-mirror;sdk-overlay;dev
@@ -1126,6 +1131,7 @@ install-llbuild
 install-libicu
 install-swiftpm
 install-swift-driver
+install-swiftsyntax
 install-foundation
 install-libdispatch
 install-xctest
@@ -1536,6 +1542,7 @@ libcxx
 # Install swift and libcxx
 install-llvm
 install-swift
+install-swiftsyntax
 install-libcxx
 
 # Build Playground support
@@ -1591,6 +1598,7 @@ install-swift
 install-llbuild
 install-swiftpm
 install-swift-driver
+install-swiftsyntax
 install-libcxx
 install-swiftdocc
 
@@ -1658,6 +1666,7 @@ install-llvm
 install-swift
 install-llbuild
 install-swiftpm
+install-swiftsyntax
 install-libcxx
 
 skip-test-swift
@@ -1945,6 +1954,7 @@ install-llvm
 install-swift
 install-llbuild
 install-swiftpm
+install-swiftsyntax
 install-xctest
 install-sourcekit-lsp
 
@@ -1977,6 +1987,7 @@ skip-build-llbuild
 skip-build-benchmarks
 install-llvm
 install-swift
+install-swiftsyntax
 install-prefix=%(install_toolchain_dir)s/usr
 build-swift-examples=0
 build-swift-tools=0
@@ -2621,6 +2632,7 @@ install-llvm
 install-swift
 install-swiftpm
 install-swift-driver
+install-swiftsyntax
 reconfigure
 verbose-build
 skip-build-benchmarks

utils/swift_build_support/swift_build_support/products/earlyswiftsyntax.py

@@ -83,7 +83,7 @@ def should_install(self, host_target):
         Whether or not this product should be installed with the given
         arguments.
         """
-        return self.args.install_all
+        return self.args.install_swiftsyntax
 
     def install(self, host_target):
         """