This pr implements the `remove-section` option for a `DXContainer`
object in `llvm-objcopy`.
It implements a base `removeParts` to the minimal `object`
representation of a `DXContainerObject`.
This is the second step to implement
https://github.com/llvm/llvm-project/issues/150275 as a compiler actions
that invokes llvm-objcopy for functionality.
This pr implements the boiler plate required to use `llvm-objcopy` for
`DXContainer` object files.
It defines a minimal structure `object` to represent the `DXContainer`
header and the following parts.
This structure is a simple representation of the object data to allow
for simple modifications at the granularity of each part. It follows
similarily to how the respective `object`s are defined for `ELF`,
`wasm`, `XCOFF`, etc.
This is the first step to implement
https://github.com/llvm/llvm-project/issues/150275 and
https://github.com/llvm/llvm-project/issues/150277 as compiler actions
that invoke `llvm-objcopy` for functionality.
