[macOS] Implement new directories hierarchy (#8741)

images/macos/scripts/tests/LLVM.Tests.ps1

@@ -0,0 +1,10 @@
+Describe "Clang/LLVM" {
+    BeforeAll {
+        $toolsetVersion = Get-ToolsetValue 'llvm.version'
+    }
+
+    It "Clang/LLVM <toolsetVersion> is installed and version is correct" {
+        $clangVersion = & "$(brew --prefix llvm@$toolsetVersion)/bin/clang" --version
+        $clangVersion[0] | Should -BeLike "*${toolsetVersion}*"
+    }
+}