[clang] [lld] [Clang][MinGW] Pass --functionpadmin to the linker when -fms-hotpatch is used (PR #116512)

[Jacek Caban via cfe-commits]

cjacek wrote:

GCC offers the `ms_hook_prologue` function attribute as an alternative. It provides similar guarantees: it inserts a hardcoded prologue and adds padding. However, it applies on a per-function basis, so there isn’t an easy way to make the entire module hotpatchable. In GCC, the padding is handled directly by the compiler, with no linker involvement, which emits assembly like:
```
        .globl  _func
        .def    _func;  .scl    2;      .type   32;     .endef
        .long    0xcccccccc
        .long    0xcccccccc
        .long    0xcccccccc
        .long    0xcccccccc
_func:
        .byte   0x8b, 0xff, 0x55, 0x8b, 0xec
        movl    $1, %eax
        popl    %ebp
        ret
```

https://github.com/llvm/llvm-project/pull/116512