Merge tag 'pull-tcg-20260119' of https://gitlab.com/rth7680/qemu into staging

Remove support for 32-bit hosts.

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# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
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* tag 'pull-tcg-20260119' of https://gitlab.com/rth7680/qemu: (54 commits)
  include/qemu/atomic: Drop aligned_{u}int64_t
  meson: Remove CONFIG_ATOMIC64
  include/qemu/atomic: Drop qatomic_{read,set}_[iu]64
  util: Remove stats64
  block: Drop use of Stat64
  migration: Drop use of Stat64
  target/s390x: Simplify atomicity check in do_csst
  target/s390x: Drop CONFIG_ATOMIC64 tests
  target/m68k: Drop CONFIG_ATOMIC64 tests
  target/hppa: Drop CONFIG_ATOMIC64 test
  target/arm: Drop CONFIG_ATOMIC64 tests
  linux-user/hppa: Drop CONFIG_ATOMIC64 test
  linux-user/arm: Drop CONFIG_ATOMIC64 test
  accel/tcg: Drop CONFIG_ATOMIC64 test from translator.c
  accel/tcg: Drop CONFIG_ATOMIC64 checks from ldst_atomicicy.c.inc
  tcg: Unconditionally define atomic64 helpers
  accel/tcg/runtime: Remove helper_nonatomic_cmpxchgo
  accel/tcg/runtime: Remove 64-bit shift helpers
  target/riscv: Drop TCG_TARGET_REG_BITS test
  target/i386/tcg: Drop TCG_TARGET_REG_BITS test
  ...

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