[VIRT-327 # Richard's upstream QEMU work ]

* Implement x86_64-linux-user vsyscall page, which should keep Peter's pre-merge testing working. * Another tcg queue pull without the bits that depend on the vsyscall implementation above. * Posted v2 of some fixes to -accel option processing. * Posted v2 of some fixes to target/arm syn data syndrome bits. * Wrote some test cases for a target/arm pauth sbox fix. * Investigated a fix for memory layout of -static-pie binaries. * Random patch review.

r~