[llvm] [CodeGen] Port WinEHPrepare to new pass manager (PR #74233)

[via llvm-commits]

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@@ -521,6 +521,12 @@ FUNCTION_PASS_WITH_PARAMS(
     "sroa", "SROAPass",
     [](SROAOptions PreserveCFG) { return SROAPass(PreserveCFG); },
     parseSROAOptions, "preserve-cfg;modify-cfg")
+FUNCTION_PASS_WITH_PARAMS(
+    "winehprepare", "WinEHPreparePass",
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paperchalice wrote:

`SjLjEHPrepare`, `WebAssemblyEHPrepare` and `DwarfEHPrepare` etc. use this naming convention but `WebAssemblyLateEHPrepare` and `DXILPrepare` not.

https://github.com/llvm/llvm-project/pull/74233