instruction: 0.538
syscall: 0.232
runtime: 0.230



Intel BLSI CF computation bug
Description of problem:
CF flag computation of BLSI instruction is wrong. It seems #1370 was not completely fixed.
Steps to reproduce:
1. Compile `example.c` using this command: `gcc -o example.bin example.c`. My gcc version is 12.3.0, but other versions may work.
```
int main() {
  __asm__ (
    "movq $0x1, %r8\n"
    "mov $0xedbf530a, %r9\n"
    "push $0x1\n"
    "popf\n"
    "blsi %r9d, %r8d\n"
    "pushf\n"
    "pop %rax\n"
    "pop %rbp\n"
    "ret\n"
  );

  return 0;
}
```
2. Run `./example.bin`. Then check the return code using `echo $?`. It should be 3.
```
$ ./example.bin
$ echo $?
3
```
3. Run `./qemu-x86_64 ./example.bin`. Then check the return code using `echo $?`. It should be 2.
```
$ ./qemu-x86_64 ./example.bin
$ echo $?
2
```

The return code of `./example.bin` contains the value of the `RFLAGS` register after executing the `BLSI` instruction.
Additional information: