[NFC][Test] Add the option -enable-no-signed-zeros-fp-math for test

fma-combine.ll

Author: QingShan Zhang

llvm/test/CodeGen/PowerPC/fma-combine.ll

@@ -1,6 +1,8 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -enable-unsafe-fp-math  < %s | FileCheck -check-prefix=CHECK-FAST %s
-; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -enable-unsafe-fp-math -mattr=-vsx < %s | FileCheck -check-prefix=CHECK-FAST-NOVSX %s
+; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -enable-no-signed-zeros-fp-math \
+; RUN:     -enable-unsafe-fp-math  < %s | FileCheck -check-prefix=CHECK-FAST %s
+; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -enable-no-signed-zeros-fp-math \
+; RUN:     -enable-unsafe-fp-math -mattr=-vsx < %s | FileCheck -check-prefix=CHECK-FAST-NOVSX %s
 ; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s
 
 define double @fma_combine1(double %a, double %b, double %c) {