Sign-extension opcodes have been split into a separate proposal from the main threads proposal, so switch them to their own target feature. See: https://github.com/WebAssembly/sign-extension-ops llvm-svn: 322966
Select them from ISD::SIGN_EXTEND_INREG Differential Revision: https://reviews.llvm.org/D37603 remove spurious change llvm-svn: 313101