ppc476 icache workaround fix for bctr

I got the ppc476 workaround wrong.  bctr (and bctrl) as the last
instruction in a page can hit the icache bug if the preceding mtctr
insn is close by, and the destination is in the first few instructions
on the next page.  This scenario can occur with code generated by gcc
to implement switch statements, or in code generated to call by
function pointer.

To prevent the bctr problem it is also necessary to remove other
instructions that otherwise would be safe.

bfd/
	* elf32-ppc.c (ppc_elf_relocate_section): Remove bctr from list
	of safe ppc476 insns at end of page.  Also remove non-branch insns.
	Expand comments.
ld/
	* emultempl/ppc32elf.em (no_zero_padding, ppc_finish): New functions.
	(LDEMUL_FINISH): Define.

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