benchmark: allow multiple values for same config

This allows running a benchmark with two or more values for the same config rather than just one or all of them, for example: ``` node benchmark/buffers/buffer-creation.js type=buffer() type=fast-alloc type=fast-alloc-fill ``` PR-URL: #11819 Reviewed-By: Joyee Cheung <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Franziska Hinkelmann <[email protected]> Reviewed-By: Brian White <[email protected]>

Author: seishun

benchmark/common.js

@@ -38,7 +38,7 @@ function Benchmark(fn, configs, options){
 }
 
 Benchmark.prototype._parseArgs=function(argv,configs){
-constcliOptions=Object.assign({},configs);
+constcliOptions={};
 constextraOptions={};
 // Parse configuration arguments
 for(constargofargv){
@@ -47,17 +47,20 @@ Benchmark.prototype._parseArgs = function(argv, configs){
 console.error('bad argument: '+arg);
 process.exit(1);
 }
+constconfig=match[1];
 
-if(configs[match[1]]){
+if(configs[config]){
 // Infer the type from the config object and parse accordingly
-constisNumber=typeofconfigs[match[1]][0]==='number';
+constisNumber=typeofconfigs[config][0]==='number';
 constvalue=isNumber ? +match[2] : match[2];
-cliOptions[match[1]]=[value];
+if(!cliOptions[config])
+cliOptions[config]=[];
+cliOptions[config].push(value);
 }else{
-extraOptions[match[1]]=match[2];
+extraOptions[config]=match[2];
 }
 }
-return{cli: cliOptions,extra: extraOptions};
+return{cli: Object.assign({},configs,cliOptions),extra: extraOptions};
 };
 
 Benchmark.prototype._queue=function(options){