[Patch, AArch64] Fix ld ifunc test failures in aarch64-*-elf

[Yufeng Zhang]

The patch fixes the failures of the ld ifunc tests in aarch64-*-elf.

The failures are due to two reasons:

1. the expected dump contains hard-coded immediate offsets that seem to 
be from the linux-gnu environment.
2. the change to emulparams/aarch64elf.sh of adding IREL_IN_PLT seems to 
be forgotten to commit; this causes the mismatch of relocation section 
name (.rela.plt versus .rela.dyn).  This missing change was mentioned in 
the changelog entry for the original ifunc patch.

OK for the trunk?

Thanks,
Yufeng

ld/

	* emulparams/aarch64elf.sh: Add IREL_IN_PLT.

ld/testsuite/

	* ld-aarch64/ifunc-1-local.d: Replace hard-coded immediate offset
	with regexp.
	* ld-aarch64/ifunc-1.d: Likewise.
	* ld-aarch64/ifunc-2-local.d: Likewise.
	* ld-aarch64/ifunc-2.d: Likewise.
	* ld-aarch64/ifunc-3a.d: Likewise.
	* ld-aarch64/ifunc-2-local.s: Change not to declare __GI_foo and foo
	global.
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