[BFD][AARCH64]Fix MOVW_SABS_G(0,1,2) relocation overflow check.

[BFD][AARCH64]Fix MOVW_SABS_G(0,1,2) relocation overflow check.

For these three relocations, 17 bit signed value should be used, instead of
16 bit. The bitsize field is changed from 16 to 17, this field in aarch64
backend is used for overflow check only.

bfd/

2016-02-26  Renlin Li  <[email protected]>

    * elfnn-aarch64.c (elfNN_aarch64_howto_table): Fix signed overflow
    check for MOVW_SABS_G0, MOVW_SABS_G1, MOVW_SABS_G2.

ld/

2016-02-26  Renlin Li  <[email protected]>

    * testsuite/ld-aarch64/aarch64-elf.exp: Run new testcases.
    * testsuite/ld-aarch64/emit-relocs-270.d: Update to use new boundary.
    * testsuite/ld-aarch64/emit-relocs-271.d: Likewise.
    * testsuite/ld-aarch64/emit-relocs-272.d: Likewise.
    * testsuite/ld-aarch64/emit-relocs-270-overflow.d: New.
    * testsuite/ld-aarch64/emit-relocs-270-overflow.s: New.
    * testsuite/ld-aarch64/emit-relocs-271-overflow.d: New.
    * testsuite/ld-aarch64/emit-relocs-271-overflow.s: New.
    * testsuite/ld-aarch64/emit-relocs-272-overflow.d: New.
    * testsuite/ld-aarch64/emit-relocs-272-overflow.s: New.