Extended Description

The code:
void AsmPrinter::PrintSpecial(const MachineInstr *MI, const char *Code) {
[...]
} else if (!strcmp(Code, "uid")) {
// Assign a unique ID to this machine instruction.
static const MachineInstr *LastMI = 0;
static unsigned Counter = 0U-1;
// If this is a new machine instruction, bump the counter.
if (LastMI != MI) { ++Counter; LastMI = MI; }
O << Counter;
} else {
[...]
}

Comparison (LastMI != MI) is incorrect. Machine Instructions of different
Machine Functions can have the same address.