[BFD][AARCH64]Properly truncate no overflow checking relocation value for load/store immediate.

[Nick Clifton]

Hi Renlin,

>> bfd/ChangeLog:
>>
>> 2018-04-27  Renlin Li  <renlin.li@arm.com>
>>
>> Â Â Â Â Â * elfxx-aarch64.c (_bfd_aarch64_elf_resolve_relocation): Use PG_OFFSET
>> Â Â Â Â Â to resolve BFD_RELOC_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC,
>> Â Â Â Â Â BFD_RELOC_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC,
>> Â Â Â Â Â BFD_RELOC_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC,
>> Â Â Â Â Â BFD_RELOC_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC,
>> Â Â Â Â Â BFD_RELOC_AARCH64_TLSLE_LDST16_TPREL_LO12_NC,
>> Â Â Â Â Â BFD_RELOC_AARCH64_TLSLE_LDST32_TPREL_LO12_NC,
>> Â Â Â Â Â BFD_RELOC_AARCH64_TLSLE_LDST64_TPREL_LO12_NC,
>> Â Â Â Â Â BFD_RELOC_AARCH64_TLSLE_LDST8_TPREL_LO12_NC.
>>
>> ld/ChangeLog:
>>
>> 2018-04-27 Renlin Li  <renlin.li@arm.com>
>>
>> Â Â Â Â Â  * testsuite/ld-aarch64/emit-relocs-115.d: Update test with new value.
>> Â Â Â Â Â  * testsuite/ld-aarch64/emit-relocs-534.d: Likewise.
>> Â Â Â Â Â  * testsuite/ld-aarch64/emit-relocs-555.d: Likewise.

Approved - please apply.

Cheers
  Nick