Update build.ps1

Update the variables for the pinned-toolchain usage to correctly specify the compilers.  Additionally use the new helpers to work with the new toolchain layout as well.

Author: compnerd

utils/build.ps1

@@ -598,7 +598,7 @@ function Build-CMakeProject {
       if ($UseBuiltCompilers.Contains("ASM")) {
         TryAdd-KeyValue $Defines CMAKE_ASM_COMPILER "$BinaryCache\1\bin\clang-cl.exe"
       } else {
-        TryAdd-KeyValue $Defines CMAKE_ASM_COMPILER "$BinaryCache\toolchains\$PinnedToolchain\Library\Developer\Toolchains\unknown-Asserts-development.xctoolchain\usr\bin\clang-cl.exe"
+        TryAdd-KeyValue $Defines CMAKE_ASM_COMPILER (Join-Path -Path (Get-PinnedToolchainTool) -ChildPath "clang-cl.exe")
       }
       Append-FlagsDefine $Defines CMAKE_ASM_FLAGS "--target=$($Arch.LLVMTarget)"
       TryAdd-KeyValue $Defines CMAKE_ASM_COMPILE_OPTIONS_MSVC_RUNTIME_LIBRARY_MultiThreadedDLL "/MD"
@@ -607,7 +607,7 @@ function Build-CMakeProject {
       if ($UseBuiltCompilers.Contains("C")) {
         TryAdd-KeyValue $Defines CMAKE_C_COMPILER "$BinaryCache\1\bin\clang-cl.exe"
       } else {
-        TryAdd-KeyValue $Defines CMAKE_ASM_COMPILER "$BinaryCache\toolchains\$PinnedToolchain\Library\Developer\Toolchains\unknown-Asserts-development.xctoolchain\usr\bin\clang-cl.exe"
+        TryAdd-KeyValue $Defines CMAKE_C_COMPILER (Join-Path -Path (Get-PinnedToolchainTool) -ChildPath "clang-cl.exe")
       }
       TryAdd-KeyValue $Defines CMAKE_C_COMPILER_TARGET $Arch.LLVMTarget
 
@@ -625,7 +625,7 @@ function Build-CMakeProject {
       if ($UseBuiltCompilers.Contains("CXX")) {
         TryAdd-KeyValue $Defines CMAKE_CXX_COMPILER "$BinaryCache\1\bin\clang-cl.exe"
       } else {
-        TryAdd-KeyValue $Defines CMAKE_ASM_COMPILER (Join-Path -Path (Get-PinnedToolchainTool) -ChildPath "clang-cl.exe")
+        TryAdd-KeyValue $Defines CMAKE_CXX_COMPILER (Join-Path -Path (Get-PinnedToolchainTool) -ChildPath "clang-cl.exe")
       }
       TryAdd-KeyValue $Defines CMAKE_CXX_COMPILER_TARGET $Arch.LLVMTarget