utils: avoid double staging the experimental SDK

Install the experimental SDK directly into the final install/stage so
that we have a complete working toolchain that we can directly package.

Author: compnerd

utils/build.ps1

@@ -241,7 +241,6 @@ $ArchX64 = @{
   LLVMTarget = "x86_64-unknown-windows-msvc";
   CMakeName = "AMD64";
   BinaryDir = "bin64";
-  ExperimentalSDKInstallRoot = "$BinaryCache\x64\Windows.platform\Developer\SDKs\WindowsExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\x64\Windows.platform\Developer\Library\XCTest-development";
   SwiftTestingInstallRoot = "$BinaryCache\x64\Windows.platform\Developer\Library\Testing-development";
   ToolchainInstallRoot = "$BinaryCache\x64\toolchains\$ProductVersion+$Variant";
@@ -255,7 +254,6 @@ $ArchX86 = @{
   LLVMTarget = "i686-unknown-windows-msvc";
   CMakeName = "i686";
   BinaryDir = "bin32";
-  ExperimentalSDKInstallRoot = "$BinaryCache\x86\Windows.platform\Developer\SDKs\WindowsExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\x86\Windows.platform\Developer\Library\XCTest-development";
   SwiftTestingInstallRoot = "$BinaryCache\x86\Windows.platform\Developer\Library\Testing-development";
   Cache = @{};
@@ -268,7 +266,6 @@ $ArchARM64 = @{
   LLVMTarget = "aarch64-unknown-windows-msvc";
   CMakeName = "ARM64";
   BinaryDir = "bin64a";
-  ExperimentalSDKInstallRoot = "$BinaryCache\arm64\Windows.platform\Developer\SDKs\WindowsExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\arm64\Windows.platform\Developer\Library\XCTest-development";
   ToolchainInstallRoot = "$BinaryCache\arm64\toolchains\$ProductVersion+$Variant";
   SwiftTestingInstallRoot = "$BinaryCache\arm64\Windows.platform\Developer\Library\Testing-development";
@@ -282,7 +279,6 @@ $AndroidARM64 = @{
   LLVMName = "aarch64";
   LLVMTarget = "aarch64-unknown-linux-android$AndroidAPILevel";
   ShortName = "arm64";
-  ExperimentalSDKInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\SDKs\AndroidExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\Library\XCTest-development";
   SwiftTestingInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\Library\Testing-development";
   Cache = @{};
@@ -295,7 +291,6 @@ $AndroidARMv7 = @{
   LLVMName = "armv7";
   LLVMTarget = "armv7-unknown-linux-androideabi$AndroidAPILevel";
   ShortName = "armv7";
-  ExperimentalSDKInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\SDKs\AndroidExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\armv7\Android.platform\Developer\Library\XCTest-development";
   SwiftTestingInstallRoot = "$BinaryCache\armv7\Android.platform\Developer\Library\Testing-development";
   Cache = @{};
@@ -308,7 +303,6 @@ $AndroidX86 = @{
   LLVMName = "i686";
   LLVMTarget = "i686-unknown-linux-android$AndroidAPILevel";
   ShortName = "x86";
-  ExperimentalSDKInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\SDKs\AndroidExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\x86\Android.platform\Developer\Library\XCTest-development";
   SwiftTestingInstallRoot = "$BinaryCache\x86\Android.platform\Developer\Library\Testing-development";
   Cache = @{};
@@ -321,7 +315,6 @@ $AndroidX64 = @{
   LLVMName = "x86_64";
   LLVMTarget = "x86_64-unknown-linux-android$AndroidAPILevel";
   ShortName = "x64";
-  ExperimentalSDKInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\SDKs\AndroidExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\x64\Android.platform\Developer\Library\XCTest-development";
   SwiftTestingInstallRoot = "$BinaryCache\x64\Android.platform\Developer\Library\Testing-development";
   Cache = @{};
@@ -1010,9 +1003,9 @@ function Get-SwiftSDK {
   (
     [Parameter(Position = 0, Mandatory = $true)]
     [Platform] $Platform,
-    [switch] $Experimental = $false
+    [string] $Identifier = $Platform.ToString()
   )
-  return ([IO.Path]::Combine((Get-PlatformRoot $Platform), "Developer", "SDKs", "${Platform}.sdk"))
+  return ([IO.Path]::Combine((Get-PlatformRoot $Platform), "Developer", "SDKs", "${Identifier}.sdk"))
 }
 
 function Build-CMakeProject {
@@ -2140,7 +2133,7 @@ function Build-ExperimentalRuntime {
     Build-CMakeProject `
       -Src $SourceCache\swift\Runtimes\Core `
       -Bin (Get-TargetProjectBinaryCache $Arch ExperimentalRuntime) `
-      -InstallTo "$($Arch.ExperimentalSDKInstallRoot)\usr" `
+      -InstallTo "$(Get-SwiftSDK $Platform -Identifier "${Platform}Experimental")\usr" `
       -Arch $Arch `
       -Platform $Platform `
       -UseBuiltCompilers C,CXX,Swift `
@@ -2252,7 +2245,7 @@ function Build-Foundation {
     Build-CMakeProject `
       -Src $SourceCache\swift-corelibs-foundation `
       -Bin $FoundationBinaryCache `
-      -InstallTo $(if ($Static) { "$($Arch.ExperimentalSDKInstallRoot)\usr" } else { "$(Get-SwiftSDK $Platform)\usr" }) `
+      -InstallTo $(if ($Static) { "$(Get-SwiftSDK $Platform -Identifier "${Platform}Experimental")\usr" } else { "$(Get-SwiftSDK $Platform)\usr" }) `
       -Arch $Arch `
       -Platform $Platform `
       -UseBuiltCompilers ASM,C,CXX,Swift `