[llvm] [llvm-objcopy][COFF] Support --rename-section (PR #210573)

[James Henderson via llvm-commits]

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+## Renaming to a $ grouping name changes only the logical name.
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jh7370 wrote:

I'm not sure I see a benefit to this test. This is testing that we don't do something that we don't ever attempt to do in the code or even something vaguely related. There are an infinite number of cases that you could test if you go down that route.

https://github.com/llvm/llvm-project/pull/210573