Mark arm strided loads as sideeffecty
Mark arm strided loads as sideeffecty

There doesn't seem to be any other way to communicate to LLVM that these
chunks of code load from memory that actually works.


Former-commit-id: 09bfacd32e313be0d61d421f5bc6308b125d16a6
Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide