[X86] avx512-vbroadcast.ll - fix orphan check prefixes

The AVX512F/AVX512BW checks had been removed despite still being used

Author: RKSimon

llvm/test/CodeGen/X86/avx512-vbroadcast.ll

@@ -1,6 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mattr=+avx512f | FileCheck %s --check-prefix=ALL
-; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mattr=+avx512bw | FileCheck %s --check-prefix=ALL
+; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mattr=+avx512f | FileCheck %s --check-prefixes=ALL,AVX512F
+; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mattr=+avx512bw | FileCheck %s --check-prefixes=ALL,AVX512BW
 
 define   <16 x i32> @_inreg16xi32(i32 %a) {
 ; ALL-LABEL: _inreg16xi32: