[AVR] Redefine the 'LSL' instruction as an alias of 'ADD'

The 'LSL Rd' instruction is equivalent to 'ADD Rd, Rd'.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341278 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed