Android supports per thread stack protectors that are individually
managed and
initialized, which can provide stronger protections than using the
global stack
protector cookie. This patch matches the convention for other
architectures
targeting Android platforms.
R_RISCV_CALL/R_RISCV_CALL_PLT distinction is not necessary and
R_RISCV_CALL has been deprecated. Since https://reviews.llvm.org/D132530
`call foo` assembles to R_RISCV_CALL_PLT. The `@plt` suffix is not
useful and can be removed now (matching AArch64 and PowerPC).
GNU assembler assembles `call foo` to RISCV_CALL_PLT since 2022-09
(70f35d72ef04cd23771875c1661c9975044a749c).
Without this patch, unconditionally changing MO_CALL to MO_PLT could
create `jump .L1@plt, a0`, which is invalid in LLVM integrated assembler
and GNU assembler.
Fuchsia provides a slot relative to tp for the stack-guard value,
which is cheaper to materialize than the default GOT load.
Reviewed By: phosek
Differential Revision: https://reviews.llvm.org/D143353
