tree d4fbe8857c811b608f1acc4627a7e66c1b59a1cc
parent 556b45ad41a1eb8c2bbfb654e08ff31e8f6e4cbf
author Peter Collingbourne <pcc@google.com> 1629331463 -0700
committer Peter Collingbourne <pcc@google.com> 1630003699 -0700

Reland "Use the dynamic table instead of __rela?_iplt_* to find the linker's IRELATIVE relocs." with a fix.

A recent change to lld [1] made it so that the __rela?_iplt_*
symbols are no longer defined for PIEs and shared libraries. Since
the linker is a PIE, this prevents it from being able to look up
its own relocations via these symbols. We don't need these symbols
to find the relocations however, as their location is available via
the dynamic table. Therefore, start using the dynamic table to find
the relocations instead of using the symbols.

Previously landed in r.android.com/1801427 and reverted in
r.android.com/1804876 due to linux-bionic breakage. This time,
search .rela.dyn as well as .rela.plt, since the linker may put the
relocations in either location (see [2]).

[1] https://github.com/llvm/llvm-project/commit/f8cb78e99aae9aa3f89f7bfe667db2c5b767f21f
[2] https://reviews.llvm.org/D65651

Bug: 197420743
Change-Id: I5bef157472e9893822e3ca507ef41a15beefc6f1