`parallel` keyword does not work as intended when used at component level

Hi. I have been playing around with the parallel keyword a bit and discovered that declaring parallel at component level renders it useless. Please look at the following toy example: version - 2.1.6 doublemultiplier.circom

pragma circom 2.1.6;

template DoubleMultiplier() {
    signal input in[4];
    signal output out[2];

    component multiplier[2];
    for (var i=0; i<2; i++) {
        multiplier[i] = parallel Multiplier();
        multiplier[i].in1 <== in[i*2];
        multiplier[i].in2 <== in[i*2+1];
        out[i] <== multiplier[i].out;
    }
}

template Multiplier() {
    signal input in1;
    signal input in2;
    signal output out;

    out <== in1 * in2;
}

component main = DoubleMultiplier();

Three build folder for the following cases:

parallel not used - build_non_parallel
parallel used at component level - build_component_parallel
parallel used at template level - build_template_parallel

After building with circom, running diff -r for build_non_parallel and build_component_parallel produces an empty output, whereas running diff -r for build_non_parallel and build_template_parallel produces non empty output, the following:

diff -r build_non_parallel/doublemultiplier_cpp/Makefile build_template_parallel/doublemultiplier_cpp/Makefile
22c22
<       $(CC) -o doublemultiplier *.o -lgmp 
---
>       $(CC) -o doublemultiplier *.o -lgmp -pthread
diff -r build_non_parallel/doublemultiplier_cpp/doublemultiplier.cpp build_template_parallel/doublemultiplier_cpp/doublemultiplier.cpp
6,7c6,7
< void Multiplier_0_create(uint soffset,uint coffset,Circom_CalcWit* ctx,std::string componentName,uint componentFather);
< void Multiplier_0_run(uint ctx_index,Circom_CalcWit* ctx);
---
> void Multiplier_0_create_parallel(uint soffset,uint coffset,Circom_CalcWit* ctx,std::string componentName,uint componentFather);
...a lot of more lines

iden3 / circom

`parallel` keyword does not work as intended when used at component level #204