Handle local IFUNC symbols in shared object

Handle local IFUNC symbols in shared object

Increment PLT reference count for locally defined local IFUNC symbols
in shared object since STT_GNU_IFUNC symbol must go through PLT even
if it is locally defined and undefined symbol may turn out to be a
STT_GNU_IFUNC symbol later.

bfd/

	PR ld/19784
	* elf32-i386.c (elf_i386_check_relocs): Increment PLT reference
	count for locally defined local IFUNC symbols in shared object.
	* elf64-x86-64.c (elf_x86_64_check_relocs): Likewise.

ld/

	PR ld/19784
	* testsuite/ld-i386/i386.exp: Remove pr19636-2e-nacl test.
	* testsuite/ld-i386/pr19636-2e-nacl.d: Moved to ...
	* testsuite/ld-i386/pr19636-2e.d: Here.  Remove notarget.
	* testsuite/ld-ifunc/ifunc.exp: Run PR ld/19784 tests.
	* testsuite/ld-ifunc/pass.out: New file.
	* testsuite/ld-ifunc/pr19784a.c: Likewise.
	* testsuite/ld-ifunc/pr19784b.c: Likewise.
	* testsuite/ld-ifunc/pr19784c.c: Likewise.