Remove code for setting the VEX L-bit as a function of operand size from the code...

Remove code for setting the VEX L-bit as a function of operand size from the code emitters and the disassembler table builder. Fix a couple instructions that were still missing VEX_L.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164204 91177308-0d34-0410-b5e6-96231b3b80d8