[NFC][X86] Add BMI runlines to align-down.ll test

Author: LebedevRI

llvm/test/CodeGen/X86/align-down.ll

@@ -1,6 +1,8 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=i686-unknown-linux-gnu < %s | FileCheck %s --check-prefixes=CHECK,X86
-; RUN: llc -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s --check-prefixes=CHECK,X64
+; RUN: llc -mtriple=i686-unknown-linux-gnu             < %s | FileCheck %s   --check-prefixes=CHECK,NOBMI,X86,NOBMI-X86
+; RUN: llc -mtriple=i686-unknown-linux-gnu -mattr=+bmi < %s | FileCheck %s   --check-prefixes=CHECK,BMI,X86,BMI-X86
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu             < %s | FileCheck %s --check-prefixes=CHECK,NOBMI,X64,NOBMI-X64
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=+bmi < %s | FileCheck %s --check-prefixes=CHECK,BMI,X64,BMI-X64
 
 ; Fold
 ;   ptr - (ptr & (alignment-1))