[clang] [flang] [flang][Driver] Add -masm option to flang (PR #81490)

[Andrzej Warzyński via cfe-commits]

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+// RUN: %flang -target x86_64-unknown-linux -masm=intel -S %s -### 2>&1 | FileCheck --check-prefix=CHECK-INTEL %s
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banach-space wrote:

1. Use Fortran style comments :)
2. Missing requires?

https://github.com/llvm/llvm-project/pull/81490