[X86] Remove the HLE feature flag.

We only implemented it for one of the 3 HLE instructions and that instruction is also under the RTM flag. Clang only implements the RTM flag from its command line.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294562 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed