[X86] Fix copy and paste bug in clzero test from r294559.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@294560 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/builtin-clzero.c

@@ -4,6 +4,6 @@
 #include <x86intrin.h>
 void test_mm_clzero(void * __m) {
   //CHECK-LABEL: @test_mm_clzero
-  //CHECK: @llvm.x86.clflushopt
+  //CHECK: @llvm.x86.clzero
   _mm_clzero(__m);
 }