Update prebuilt GCC to build 2617618.

Highlights
 * gold linker fix for the noisy A53 errata messages
 * gold linker fix for huge arm32 PLT overflow bug (PR gold/18780)

Bug: http://b/26536732

Change-Id: I19ff27f2b8f1f23d8c9bffbba682fd79dba8ebe1
33 files changed