x86: Create dynamic sections in create_dynamic_sections

x86: Create dynamic sections in create_dynamic_sections

This patch creates dynamic sections in i386/x86-64 create_dynamic_sections
instead of creating them on demend.  Linker will strip them if they are
empty.  It changes order in x86-64 .eh_frame section.  The extra DW_CFA_nop
paddings is due to

https://sourceware.org/bugzilla/show_bug.cgi?id=21441

bfd/

	* elf32-i386.c (elf_i386_create_dynamic_sections): Create the
	.plt.got section here.
	(elf_i386_check_relocs): Don't create the .plt.got section.
	* elf64-x86-64.c (elf_x86_64_create_dynamic_sections): Create
	the .plt.got and .plt.bnd sections here.
	(elf_x86_64_check_relocs): Don't create the .plt.got nor
	.plt.bnd sections.

ld/

	* testsuite/ld-x86-64/pr21038a.d: Update DW_CFA_nop paddings
	in .eh_frame section.
	* testsuite/ld-x86-64/pr21038c.d: Update .eh_frame order.