[Bug target/70014] [ARM] Predicate does not match constraint (*subsi3_carryin_const)

[rearnsha at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70014

--- Comment #1 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
More importantly, the constraint on operand 2 is for just a constant.  but the
predicate accepts a register.  That's something the register allocator could
not handle.