Use -triple instead of -arch.

Change-Id: Id8d527019ffc90f850c20133fdd2b71a7156d92c

Author: quic-akaryaki

llvm/test/MC/Hexagon/hvx-nv-pair-reverse.s

@@ -1,5 +1,5 @@
-# RUN: llvm-mc -arch=hexagon -mv69 -mhvx -filetype=obj %s | \
-# RUN:   llvm-objdump --arch=hexagon --mcpu=hexagonv69 --mattr=+hvx -d - | \
+# RUN: llvm-mc -triple=hexagon -mv69 -mhvx -filetype=obj %s | \
+# RUN:   llvm-objdump --triple=hexagon --mcpu=hexagonv69 --mattr=+hvx -d - | \
 # RUN:   FileCheck %s
 # CHECK: 00000000 <.text>: