cmd/link: support PIE on linux/s390x without cgo Enable PIE builds on linux/s390x when CGO is disabled by teaching the linker to handle dynamic relocations against SDYNIMPORT symbols. This adds support for TLS_IE and handles R_CALL, R_PCRELDBL, and R_ADDR relocations by generating the appropriate PLT/GOT entries instead of rejecting them as unsupported. Fixes #77449 Cq-Include-Trybots: luci.golang.try:gotip-linux-s390x Change-Id: Ib6586780073fedbcbd42b9a2c554a99dd7386aa6 Reviewed-on: https://go-review.googlesource.com/c/go/+/742342 Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Quim Muntal <quimmuntal@gmail.com> Reviewed-by: Junyang Shao <shaojunyang@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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