Try to pass full path to v8

Also remove --experimental-wasm-simd option, which shouldn't be needed
for newer v8

Author: radekdoulik

eng/testing/WasmRunnerAOTTemplate.sh

@@ -37,8 +37,7 @@ if [[ "$XHARNESS_COMMAND" == "test" ]]; then
 			JS_ENGINE="--engine=NodeJS"
 			JS_ENGINE_ARGS="$JS_ENGINE_ARGS --engine-arg=--experimental-wasm-simd"
 		else
-			JS_ENGINE="--engine=V8"
-			JS_ENGINE_ARGS="$JS_ENGINE_ARGS --engine-arg=--experimental-wasm-simd"
+			JS_ENGINE="--engine=/home/helixbot/.jsvu/bin/v8"
 		fi
 	fi