[clang-tools-extra] [llvm-objcopy] Add --gap-fill and --pad-to options (PR #65815)

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quic-akaryaki wrote:

I created another PR related to missing argument values: https://github.com/llvm/llvm-project/pull/70710.
It is a problem in objdump as the LLVM args parser detects a missing value, but objdump (and many other tools) ignores it.
That will be a breaking change.

https://github.com/llvm/llvm-project/pull/65815