Generate 64bit address size in x86-64 DWARF.
Generate 64bit address size in x86-64 DWARF.

GCC generates DWARF header that must agree to what GAS writes and GDB sees.
Bringing all tools to operate on 64bit ELF and 64bit DWARF.

note: This could be decided to do otherwise, i.e. all-32bit. The amount of
changes required to perform that is significantly bigger (needs to update
objdump, readelf, other?).
Review URL: http://codereview.chromium.org/1525008

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@1953 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client