fixup! tcg-aarch64: Introduce tcg_out_ldst_pair
fixup! tcg-aarch64: Use symbolic names for branches
fixup! tcg-aarch64: Handle constant operands to and, or, xor
tcg-aarch64: Rearrange the stack frame

Modifies the stack pointer only once.  For this, we need to place the
saved registers in the middle of the frame, so that they're reachable
via the 7-bit scaled offset of ldp/stp.  The TCG TEMP_BUF is moved to
the top of the frame, but we'll access that via 12-bit scaled offset.

Signed-off-by: Richard Henderson <rth@twiddle.net>