Fix implicit fall through compiler warning. NFCI.
This appears to change behavior - any chance of test coverage?
@dblaikie Not as far as I can work out - from what I can tell the integer types should have been legalized at that point, but preventing the implicit fall-through appeases compilers/analyzers and guarantees that we end up with a fatal error instead of a float dereference.
Looks like llvm_unreachable might be more appropriate here? Since the fully covered switch (assuming that's what you mean by legalize - that the only values for the bit width should be the 8, 16, 32, 64 covered by the switch) above returns from every case?