Merge tag 'pull-request-2023-07-10v2' of https://gitlab.com/thuth/qemu into staging

* s390x instruction emulation fixes and corresponding TCG tests
* Extend the readconfig qtest
* Introduce "-run-with chroot=..." and deprecate the old "-chroot" option
* Speed up migration tests
* Fix coding style in the coding style document

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* tag 'pull-request-2023-07-10v2' of https://gitlab.com/thuth/qemu: (21 commits)
  docs/devel: Fix coding style in style.rst
  tests/qtest: massively speed up migration-test
  tests/tcg/s390x: Fix test-svc with clang
  meson.build: Skip C++ detection unless we're targeting Windows
  os-posix: Allow 'chroot' via '-run-with' and deprecate the old '-chroot' option
  tests/qtest/readconfig: Test the docs/config/q35-*.cfg files
  tests/qtest: Move mkimg() and have_qemu_img() from libqos to libqtest
  tests/qtest/readconfig-test: Allow testing for arbitrary memory sizes
  tests/tcg/s390x: Test MVCRL with a large value in R0
  tests/tcg/s390x: Test MDEB and MDEBR
  tests/tcg/s390x: Test LRA
  tests/tcg/s390x: Test LARL with a large offset
  tests/tcg/s390x: Test EPSW
  target/s390x: Fix relative long instructions with large offsets
  target/s390x: Fix LRA when DAT is off
  target/s390x: Fix LRA overwriting the top 32 bits on DAT error
  target/s390x: Fix MVCRL with a large value in R0
  target/s390x: Fix MDEB and MDEBR
  target/s390x: Fix EPSW CC reporting
  linux-user: elfload: Add more initial s390x PSW bits
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>