Fix test target_cpu_features.f90

Change-Id: Iae75abc3e4d1508f08080f687aba0ee1af74da2b

Author: yxsamliu

flang/test/Lower/OpenMP/target_cpu_features.f90

@@ -7,7 +7,7 @@
 
 !CHECK: omp.target = #omp.target<target_cpu = "gfx908",
 !CHECK-SAME: target_features = "+dot3-insts,+dot4-insts,+s-memtime-inst,
-!CHECK-SAME: +16-bit-insts,+s-memrealtime,+dot6-insts,+dl-insts,+wavefrontsize64,
+!CHECK-SAME: +16-bit-insts,+s-memrealtime,+dot6-insts,+dl-insts,+image-insts,+wavefrontsize64,
 !CHECK-SAME: +gfx9-insts,+gfx8-insts,+ci-insts,+dot10-insts,+dot7-insts,
 !CHECK-SAME: +dot1-insts,+dot5-insts,+mai-insts,+dpp,+dot2-insts">
 !CHECK-LABEL: func.func @_QPomp_target_simple() {