Add v2i4 store test case (PR20012)
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=i686-unknown-linux-gnu | FileCheck %s --check-prefix=X86
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s --check-prefix=X64

define void @test () {
; X86-LABEL: test:
; X86:       # BB#0:
; X86-NEXT:    movb $0, (%eax)
; X86-NEXT:    retl
;
; X64-LABEL: test:
; X64:       # BB#0:
; X64-NEXT:    movb $0, (%rax)
; X64-NEXT:    retq
  store <2 x i4> zeroinitializer, <2 x i4>* undef, align 1
  ret void
}