[llvm][AArch64] Fix Arm 32 bit build warnings (#90862)
https://github.com/llvm/llvm-project/pull/84173 added uses of std::labs
on an int64_t which leads to this warning on Arm 32 bit:
```
/home/david.spickett/llvm-project/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp:16655:12: warning: absolute value function 'labs' given an argument of type 'long long' but has parameter of type 'long' which may cause truncation of value [-Wabsolute-value]
return std::labs(Imm / 4) <= 16;
^
/home/david.spickett/llvm-project/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp:16655:12: note: use function 'std::abs' instead
return std::labs(Imm / 4) <= 16;
^~~~~~~~~
std::abs
```
Since int64_t is "long long" on Arm, not "long".
Use std::abs instead since it has versions for "long" and "long long",
we'll pick up the right one at compile time
(https://en.cppreference.com/w/cpp/numeric/math/abs).
