Since kernel modules can now contain sections of type SHT_AMD64_UNWIND,

the boot loader should not skip over these anymore while loading images.
Otherwise the kernel can still panic when it doesn't find the .eh_frame
section belonging to the .rela.eh_frame section.

Unfortunately this will require installing boot loaders from sys/boot
before attempting to boot with a new kernel.

Reviewed by:	kib
MFC after:	2 weeks
X-MFC-With:	r296419

sys/boot/common/load_elf_obj.c

@@ -221,6 +221,9 @@ __elfN(obj_loadimage)(struct preloaded_file *fp, elf_file_t ef, u_int64_t off)
 		switch (shdr[i].sh_type) {
 		case SHT_PROGBITS:
 		case SHT_NOBITS:
+#if defined(__i386__) || defined(__amd64__)
+		case SHT_AMD64_UNWIND:
+#endif
 			lastaddr = roundup(lastaddr, shdr[i].sh_addralign);
 			shdr[i].sh_addr = (Elf_Addr)lastaddr;
 			lastaddr += shdr[i].sh_size;