[x86] shiftRightAlgebraic -> shiftRightArithmetic; NFC

x86 re-education camp is in session. The LLVM LangRef agrees with x86 too.
The DAG nodes are undocumented and ambiguous as always. :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314024 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed