fix test

Author: RolandF77

llvm/test/CodeGen/PowerPC/dmr-enable.ll

@@ -2,7 +2,7 @@
 ; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu \
 ; RUN:   -mcpu=future -ppc-asm-full-reg-names \
 ; RUN:   -ppc-vsr-nums-as-vr < %s | FileCheck %s
-; RUN: llc -verify-machineinstrs -mtriple=powerpc64-unknown-linux-gnu \
+; RUN: llc -verify-machineinstrs -mtriple=powerpc64-ibm-aix \
 ; RUN:   -mcpu=future -ppc-asm-full-reg-names \
 ; RUN:   -ppc-vsr-nums-as-vr < %s | FileCheck %s --check-prefix=CHECK-BE