cmd/ld: support for relocation variants
Most ppc64 relocations come in six or more variants where the basic relocation formula is the same, but which bits of the computed value are installed where changes. Introduce the concept of "variants" for internal relocations to support this. Since this applies to architecture-independent relocation types like R_PCREL, we do this in relocsym. Currently there is only an identity variant. A later CL that adds support for ppc64 ELF relocations will introduce more. Change-Id: I0c5f0e7dbe5beece79cd24fe36267d37c52f1a0c Reviewed-on: https://go-review.googlesource.com/2005Reviewed-by:Russ Cox <rsc@golang.org>
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