[Clang] Add vcmla and rotated variants for Arm ACLE.

This patch adds vcmla and the rotated variants as defined in
"Arm Neon Intrinsics Reference for ACLE Q3 2020" [1]

The *_lane_* are still missing, but they can be added separately.

This patch only adds the builtin mapping for AArch64.

[1] https://developer.arm.com/documentation/ihi0073/latest

Reviewed By: t.p.northover

Differential Revision: https://reviews.llvm.org/D92930