[lldb] [clang] [llvm] [clang-tools-extra] Add new API in SBTarget for loading core from SBFile (PR #71769)

[via cfe-commits]

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@@ -627,7 +628,7 @@ class Target : public std::enable_shared_from_this<Target>,
   // used.
   const lldb::ProcessSP &CreateProcess(lldb::ListenerSP listener_sp,
                                        llvm::StringRef plugin_name,
-                                       const FileSpec *crash_file,
+                                       lldb::FileSP crash_file,
                                        bool can_connect);
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GeorgeHuyubo wrote:

If we move the open file code into Target.cpp, it's hard to handle error. Now in these 4 locations we have slightly different ways to report the error when the file is failed to open.
```
        if (!file) {
          result.AppendErrorWithFormatv(
              "Failed to open the core file '{0}': '{1}.'\n",
              core_file.GetPath(), llvm::toString(file.takeError()));
        }
```

https://github.com/llvm/llvm-project/pull/71769