[clang] [clang][driver][darwin] Prefer DarwinSDKInfo for platform identification and compatibility over the -isysroot path (PR #176541)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,h,cpp -- clang/include/clang/Basic/DarwinSDKInfo.h clang/lib/Basic/DarwinSDKInfo.cpp clang/lib/Driver/ToolChains/Darwin.cpp clang/lib/Driver/ToolChains/Darwin.h clang/test/Driver/darwin-sdk-with-prefix.c clang/test/Driver/xros-driver-requires-darwin-host.c --diff_from_common_commit
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``````````diff
diff --git a/clang/lib/Driver/ToolChains/Darwin.cpp b/clang/lib/Driver/ToolChains/Darwin.cpp
index d512acea5..dbe17bf80 100644
--- a/clang/lib/Driver/ToolChains/Darwin.cpp
+++ b/clang/lib/Driver/ToolChains/Darwin.cpp
@@ -1788,7 +1788,7 @@ struct DarwinPlatform {
 
   /// Returns true if the simulator environment can be inferred from the arch.
   bool canInferSimulatorFromArch() const { return InferSimulatorFromArch; }
-    
+
   DarwinSDKInfo::SDKPlatformInfo getPlatformInfo() const {
     llvm::Triple::OSType OS = getOSFromPlatform(Platform);
     llvm::Triple::EnvironmentType EnvironmentType =

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https://github.com/llvm/llvm-project/pull/176541