utils: build Differentiation in the experimental SDK

Add the differentiation module to the experimental SDK on Windows.

Author: compnerd

utils/build.ps1

@@ -713,6 +713,7 @@ enum Project {
   ExperimentalSynchronization
   ExperimentalDistributed
   ExperimentalObservation
+  ExperimentalDifferentiation
   ExperimentalDispatch
   StaticFoundation
 }
@@ -2594,6 +2595,24 @@ function Build-ExperimentalRuntime {
         CMAKE_STATIC_LIBRARY_PREFIX_Swift = "lib";
         CMAKE_SYSTEM_NAME = $Platform.OS.ToString();
 
+        SwiftCore_DIR = "$(Get-ProjectBinaryCache $Platform ExperimentalRuntime)\cmake\SwiftCore";
+      }
+
+    Build-CMakeProject `
+      -Src $SourceCache\swift\Runtimes\Supplemental\Differentiation `
+      -Bin (Get-ProjectBinaryCache $Platform ExperimentalDifferentiation) `
+      -InstallTo "$(Get-SwiftSDK $Platform.OS -Identifier "$($Platform.OS)Experimental")\usr" `
+      -Platform $Platform `
+      -UseBuiltCompilers CXX,Swift `
+      -UseGNUDriver `
+      -Defines @{
+        BUILD_SHARED_LIBS = if ($Static) { "NO" } else { "YES" };
+        CMAKE_FIND_PACKAGE_PREFER_CONFIG = "YES";
+        CMAKE_Swift_COMPILER_TARGET = (Get-ModuleTriple $Platform);
+        CMAKE_Swift_COMPILER_WORKS = "YES";
+        CMAKE_STATIC_LIBRARY_PREFIX_Swift = "lib";
+        CMAKE_SYSTEM_NAME = $Platform.OS.ToString();
+
         SwiftCore_DIR = "$(Get-ProjectBinaryCache $Platform ExperimentalRuntime)\cmake\SwiftCore";
       }
   }