(arm64) Extend branch range in __memcpy_chk.

Conditional branch has limited range (1MB) and can not be extended by
the linker. The current distance (in walleye build) is 500KB, about
half of the maximum. HWASan pushes it over the limit.

Replace conditional branch with regular branch, which has longer
range (26 vs 19 bits offset) and can be extended in the linker if
needed.

Bug: 112437884
Bug: 12231437
Test: SANITIZE_TARGET=hwaddress

Change-Id: Idc083fb557ab3a859541beb009809992406a6703