[clang] [clang][Driver] Add support for XROS_DEPLOYMENT_TARGET env var (PR #81011)

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``````````bash
git-clang-format --diff ab92f6274b7c3a4b4445d47017bc481aa919545f 5a60725a1abf5a56c4a482c56ea91990074ee17c -- clang/test/Driver/xros-driver-requires-darwin-host.c clang/lib/Driver/ToolChains/Darwin.cpp clang/lib/Driver/ToolChains/Darwin.h
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View the diff from clang-format here.
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diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index cc1219d69d..0ee2b074a4 100644
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -1897,13 +1897,9 @@ getDeploymentTargetFromEnvironmentVariables(const Driver &TheDriver,
                                             const llvm::Triple &Triple) {
   std::string Targets[Darwin::LastDarwinPlatform + 1];
   const char *EnvVars[] = {
-      "MACOSX_DEPLOYMENT_TARGET",
-      "IPHONEOS_DEPLOYMENT_TARGET",
-      "TVOS_DEPLOYMENT_TARGET",
-      "WATCHOS_DEPLOYMENT_TARGET",
-      "DRIVERKIT_DEPLOYMENT_TARGET",
-      "XROS_DEPLOYMENT_TARGET"
-  };
+      "MACOSX_DEPLOYMENT_TARGET",    "IPHONEOS_DEPLOYMENT_TARGET",
+      "TVOS_DEPLOYMENT_TARGET",      "WATCHOS_DEPLOYMENT_TARGET",
+      "DRIVERKIT_DEPLOYMENT_TARGET", "XROS_DEPLOYMENT_TARGET"};
   static_assert(std::size(EnvVars) == Darwin::LastDarwinPlatform + 1,
                 "Missing platform");
   for (const auto &I : llvm::enumerate(llvm::ArrayRef(EnvVars))) {

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https://github.com/llvm/llvm-project/pull/81011