Change __builtin_ia32_bextri_u64 to take an i64imm to match up with LLVM backend changes.

An explicit cast is still needed in tbmintrin.h to convert any big integer down to i32imm.

Patch from Yunzhong Gao.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191872 91177308-0d34-0410-b5e6-96231b3b80d8