android{12|13}-5.10 branches failing due to SRSO mitigations

[nickdesaulniers]

I have an internal bug filed to track this. Dumping its contents:

aosp/2736406 and aosp/2736405 upgraded our android13 and android12 linux-5.10.y based branches to v5.10.189. These contain the SRSO mitigations which broke the x86_64 build for LLD users.

At least one fix cb1eefc0463491ee09ce79acc44dc764e5269224 is in v5.10.191. If we're not planning another LTS uprev soon, then we should plan to cherry-pick the fixes from linux-5.10.y into the downstream android branches.

IIRC, there were three breakages from that SRSO mitigation series. All were resolved in stable; let me try to track down the necessary cherry-picks.

An interested question posed by GKH that I don't yet have an answer for:

How come TH didn't catch this.

Looking at the TH logs for the android12-5.10 merge, I can see that:

LLVM=1 was set, so LLD is being used.
the build succeeded.
Looking again at my CI dashboard, https://github.com/ClangBuiltLinux/continuous-integration2#readme, initially it looks like it may be [linker] version related, but it's more so the case that the CI jobs for older toolchains are run less frequently. Let me rekick those jobs manually and see if this is linker version related or not.

[nickdesaulniers]

Probably also need

commit 26e3f7690cda ("x86/retpoline,kprobes: Fix position of thunk sections with CONFIG_LTO_CLANG")

from v5.10.192

ClangBuiltLinux/linux#1909