[Hexagon] Guard the generation of lookup table

The llvm flag "-hexagon-emit-lookup-tables" guards the generation
of lookup table generated from a switch statement.
Differential Revision: https://reviews.llvm.org/D34819


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306877 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed