Small issue with resolution of optional labels.

[hach-que]

test.c:

int main()
{
    return 0;
}

Run these commands:

dtcc/dtcc test.c -o test.dasm16
dtasm/dtasm test.dasm16 -o test.dobj16 -i
dtld/dtld -j kernel/stubsys.djmp16 -k kernel/stubsys.dkrn16 stdlib-c/stdlib.dlib16 test.dobj16 -o test.dcpu16
dtdb/dtdb test.dcpu16 -c "disasm 0x0 0x2F"

Output from dtdb will be:

Created VM.
hw:0:12d0b402:0:0
Loaded 0x0BFA words from test.dcpu16.
Flashed memory.
0x0000 (0x7F81):  >>> SET PC, 0x001F
0x0002 (0x00E9):      MDI J, A
0x0003 (0x00EC):      XOR J, A
0x0004 (0x00EF):      SHL J, A
0x0005 (0x00F1):      IFC J, A
0x0006 (0x0301):      SET PUSH, A
0x0007 (0x0701):      SET PUSH, B
0x0008 (0x84C1):      SET I, 0x0000
0x0009 (0x80D2):      IFE I, 0xFFFFFFFF
0x000A (0xEF81):      SET PC, 0x001A
0x000B (0x6CE1):      SET J, SP
0x000C (0x1A20):      HWQ [B+0x0000], I
0x000D (0x3C13):      IFN A, [J]
0x000E (0xE381):      SET PC, 0x0017
0x000F (0x5C32):      IFE B, [J+0x0001]
0x0011 (0xF781):      SET PC, 0x001C
0x0012 (0xE381):      SET PC, 0x0017
0x0013 (0x88C2):      ADD I, 0x0001
0x0014 (0xBB81):      SET PC, 0x000D
0x0015 (0x8401):      SET A, 0x0000
0x0016 (0x6381):      SET PC, POP
0x0017 (0x8F62):      ADD SP, 0x0002
0x0018 (0x1801):      SET A, I
0x0019 (0x6381):      SET PC, POP
0x001A (0x7C20):      JSR B, 0x0038
0x001C (0x7C01):      SET A, 0x7349
0x001E (0x7C21):      SET B, 0xF615
0x0020 (0x9C20):      JSR B, 0x0006
0x0021 (0x0301):      SET PUSH, A
0x0022 (0x8401):      SET A, 0x0000
0x0023 (0x7C21):      SET B, 0x8000
0x0025 (0x6240):      HWI [C+0x0000], POP
0x0026 (0x87F2):      IFE 0x0BF9, 0x0000
0x0028 (0x7C20):      JSR B, 0x00B8
0x002A (0x87F3):      IFN 0x0BF9, 0x0000
0x002C (0x8420):      JSR B, 0x0000
0x002D (0x7F81):      SET PC, 0x0033

Issue is instructions 0x2A -> 0x2C. If you look at the kernel/stubsys/start.dasm16, you can see that it's successfully replacing _start in the IFN instruction, but it doesn't do it for the JSR (which jumps to 0x0!)