PowerPC32 treatment of absolute symbols

PowerPC32 treatment of absolute symbols

As already done for PowerPC64, fix dynamic relocs for absolute symbols.
The patch also tidies the dynamic reloc handling code in check_relocs,
removing leftover comments and code from when check_relocs was called
as each object file was read in.

bfd/
	* elf32-ppc.c (ppc_elf_check_relocs): Set isym and ifunc earlier.
	Rearrange tests for dynamic relocs, handling absolute symbols.
	(allocate_dynrelocs): Don't allocate dynamic relocs for locally
	defined absolute symbols.
	(ppc_elf_size_dynamic_sections): Similarly.
	(ppc_elf_relocate_section): Similarly.
ld/
	* testsuite/ld-powerpc/abs32-pie.d,
	* testsuite/ld-powerpc/abs32-pie.r,
	* testsuite/ld-powerpc/abs32-reloc.s,
	* testsuite/ld-powerpc/abs32-shared.d,
	* testsuite/ld-powerpc/abs32-shared.r,
	* testsuite/ld-powerpc/abs32-static.d,
	* testsuite/ld-powerpc/abs32-static.r: New tests.
	* testsuite/ld-powerpc/powerpc.exp: Run them.