Since mcount_internal is called from mcount/__fentry__ which preserve
only RAX, RCX, RDX, RSI, RDI, R8 and R9, compile mcount.c with

-fno-tree-loop-distribute-patterns -mgeneral-regs-only -mno-apxf

to void vector/r16-r31 registers and memcpy/memset in mcount_internal.
This fixes BZ #33134.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Andreas K. Huettel <dilfridge@gentoo.org>