gotest: Recognize PPC ELF v2 function pointers in text section.
gotest: Recognize PPC ELF v2 function pointers in text section.

R=iant
CC=gofrontend-dev
https://golang.org/cl/28750043

qskycolor/gofrontend,anlhord/gofrontend,golang/gofrontend,qskycolor/gofrontend,golang/gofrontend,anlhord/gofrontend,golang/gofrontend,qskycolor/gofrontend,anlhord/gofrontend,qskycolor/gofrontend,qskycolor/gofrontend,anlhord/gofrontend,anlhord/gofrontend,anlhord/gofrontend,golang/gofrontend,anlhord/gofrontend,qskycolor/gofrontend,qskycolor/gofrontend