[MC][COFF] Add COFF section flag "Info"

[MC][COFF] Add COFF section flag "Info"

For now, we have not parse section flag `Info` in asm file. When we emit a section with info flag to asm, then compile asm to obj we will lose the Info flag for the section.
The motivation of this change is ARM64EC's hybmp$x section. If we lose the Info flag MSVC link will report a warning:
`warning LNK4078: multiple '.hybmp' sections found with different attributes`

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D136125