Should understand call+pop to get the current program counter

Subject: https://github.com/rfalke/decompiler-subjects/blob/master/from_holdec/get_i386_pc/ia32_elf/subject.exe

Output:
```
int main(int argc, char ** argv) {
// 0x8049060
printf("0x%08x: address of main\n", 0x8049060);
int32_t v1; // 0x8049060
printf("0x%08x: eip\n", v1);
return 0;
}
```

Expected:
```
...
printf("0x%08x: eip\n", 0x08049087);
...
```

Run RetDec on the subject.exe linked in the issue and compare the current output with the expected eip value. Trace the decompiler's handling of the call+pop sequence that obtains the program counter; done means the output reports 0x08049087 instead of an uninitialized v1.

Written by the indexing model from the issue text.