[clang] [flang] [flang][cuda] Add -fcuda option (PR #84944)

[Valentin Clement バレンタイン クレメン via cfe-commits]

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+! Test -fcuda option
+! RUN: %flang -fc1 -cpp -fcuda -fdebug-unparse %s -o - | FileCheck %s
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clementval wrote:

Without it, it would just fail during parsing. Do you want a test that check the failure?

https://github.com/llvm/llvm-project/pull/84944