Use snippets in LIRGenerator

[D.Sturm]

Hi,
Division under aarch64 does not generate an implicit exception in case of
division by 0, therefore I have to generate code along the lines of:

if (divisor == 0) throw new ArithmethicException("Division by 0");
result = dividend / divisor;

for emitDiv, etc. Now I could implement that all as low-level code in the
LIR, but on the other hand we already know how to create new objects and
throw exceptions, so I was wondering if there's a way to use Snippets to
avoid doing this manually?

-- Daniel