[Bug target/68494] [ARM] Use vector multiply by lane

[michael.collison at linaro dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68494

--- Comment #3 from Michael Collison <michael.collison at linaro dot org> ---
Previous discussion thread here:

https://gcc.gnu.org/ml/gcc/2013-09/msg00061.html