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[llvm-objcopy] [COFF] Add a testcase for patching the debug directory. NFC.

Description

[llvm-objcopy] [COFF] Add a testcase for patching the debug directory. NFC.

The debug directory contains the rwa file address of itself,
which is updated on write. Add a testcase for this existing
functionality.

Differential Revision: https://reviews.llvm.org/D56876