[wasm] Use special exitcodes when AOT test build fails, and when it gets oom-killed

Author: radical

eng/testing/WasmRunnerAOTTemplate.sh

@@ -38,13 +38,22 @@ function _buildAOTFunc()
 	dotnet msbuild $binLog -clp:PerformanceSummary -v:q -nologo
 	if [[ "$(uname -s)" == "Linux" && $buildExitCode -ne 0 ]]; then
 		echo "\nLast few messages from dmesg:\n"
-		dmesg | tail -n 20
+		local lastLines=`dmesg | tail -n 20`
+		echo $lastLines
+
+		if [[ "$lastLines" =~ "oom-kill" ]]; then
+			return 9200 # OOM
+		fi
 	fi
 
 	echo
 	echo
 
-	return $buildExitCode
+    if [[ $buildExitCode -ne 0 ]]; then
+        return 9100 # aot build failure
+    fi
+
+	return 0
 }
 
 # RunCommands defined in tests.mobile.targets