[X86] Don't promote i16 compares to i32 if the immediate will fit in 8 bits.

[X86] Don't promote i16 compares to i32 if the immediate will fit in 8 bits.

The comments in this code say we were trying to avoid 16-bit immediates, but if the immediate fits in 8-bits this isn't an issue. This avoids creating a zero extend that probably won't go away.

The movmskb related changes are interesting. The movmskb instruction writes a 32-bit result, but fills the upper bits with 0. So the zero_extend we were previously emitting was free, but we turned a -1 immediate that would fit in 8-bits into a 32-bit immediate so it was still bad.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@343871 91177308-0d34-0410-b5e6-96231b3b80d8