AMDGPU: Disambiguate v3f16 format in load/store tables

Currently the searchable tables report the number of dwords. These
round to the same number for 3 and 4 component d16
instructions. Change this to report the number of elements so this
isn't ambiguous.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@369202 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed