Improve the perf of JDTUtils.toLocation()

[jdneo]

We introduced a fancy feature about Lombok support that allows more accurate code navigation and refactoring for the lombok generated methods in #2339

Recently I found that the change to the JDTUtils.toLocation() might have some impact on the perf when the class has a large number of fields. See the profiling screenshots below:

Most of the execution time is taken by the newly added getGetter() & getSetter(). It's acceptable when those methods are invoked for code actions since they are triggered manually. While considering that document symbol calculation is a frequent request when user is typing. We might need to improve it.

Steps to reproduce

1. Add Lombok dependency
2. Using the following class

import lombok.Data;

@Data
public class D {
    public int a1;
    public int a2;
    public int a3;
    public int a4;
    public int a5;
    public int a6;
    public int a7;
    public int a8;
    public int a9;
    public int a10;
    public int a11;
    public int a12;
    public int a13;
    public int a14;
    public int a15;
    public int a16;
    public int a17;
    public int a18;
    public int a19;
    public int a20;
    public int a21;
    public int a22;
    public int a23;
    public int a24;
    public int a25;
    public int a26;
    public int a27;
    public int a28;
    public int a29;
    public int a30;
    public int a31;
    public int a32;
    public int a33;
    public int a34;
    public int a35;
    public int a36;
    public int a37;
    public int a38;
    public int a39;
    public int a40;
    public int a41;
    public int a42;
    public int a43;
    public int a44;
    public int a45;
    public int a46;
    public int a47;
    public int a48;
    public int a49;
    public int a50;
    public int a51;
    public int a52;
    public int a53;
    public int a54;
    public int a55;
    public int a56;
    public int a57;
    public int a58;
    public int a59;
    public int a60;
    public int a61;
    public int a62;
    public int a63;
    public int a64;
    public int a65;
    public int a66;
    public int a67;
    public int a68;
    public int a69;
    public int a70;
    public int a71;
    public int a72;
    public int a73;
    public int a74;
    public int a75;
    public int a76;
    public int a77;
    public int a78;
    public int a79;
    public int a80;
    public int a81;
    public int a82;
    public int a83;
    public int a84;
    public int a85;
    public int a86;
    public int a87;
    public int a88;
    public int a89;
    public int a90;
    public int a91;
    public int a92;
    public int a93;
    public int a94;
    public int a95;
    public int a96;
    public int a97;
    public int a98;
    public int a99;
    public int a100;

    public int b1;
    public int b2;
    public int b3;
    public int b4;
    public int b5;
    public int b6;
    public int b7;
    public int b8;
    public int b9;
    public int b10;
    public int b11;
    public int b12;
    public int b13;
    public int b14;
    public int b15;
    public int b16;
    public int b17;
    public int b18;
    public int b19;
    public int b20;
    public int b21;
    public int b22;
    public int b23;
    public int b24;
    public int b25;
    public int b26;
    public int b27;
    public int b28;
    public int b29;
    public int b30;
    public int b31;
    public int b32;
    public int b33;
    public int b34;
    public int b35;
    public int b36;
    public int b37;
    public int b38;
    public int b39;
    public int b40;
    public int b41;
    public int b42;
    public int b43;
    public int b44;
    public int b45;
    public int b46;
    public int b47;
    public int b48;
    public int b49;
    public int b50;
    public int b51;
    public int b52;
    public int b53;
    public int b54;
    public int b55;
    public int b56;
    public int b57;
    public int b58;
    public int b59;
    public int b60;
    public int b61;
    public int b62;
    public int b63;
    public int b64;
    public int b65;
    public int b66;
    public int b67;
    public int b68;
    public int b69;
    public int b70;
    public int b71;
    public int b72;
    public int b73;
    public int b74;
    public int b75;
    public int b76;
    public int b77;
    public int b78;
    public int b79;
    public int b80;
    public int b81;
    public int b82;
    public int b83;
    public int b84;
    public int b85;
    public int b86;
    public int b87;
    public int b88;
    public int b89;
    public int b90;
    public int b91;
    public int b92;
    public int b93;
    public int b94;
    public int b95;
    public int b96;
    public int b97;
    public int b98;
    public int b99;
    public int b100;

    public static void main(String[] args) {
        
    }
}

3. Randomly type something in the main method to invoke some document symbol requests.

[jdneo]

@snjeza Would you like to take a look at this issue?

[snjeza]

@jdneo I will check it.