x87: missing code for fcom and ftst

Subject: https://github.com/rfalke/decompiler-subjects/blob/master/from_holdec/i386_x87_fpu/ia32_elf/subject.exe
Output:
```
int32_t FCOM(int32_t a1) {
// 0x804a2f0
__asm_wait();
int32_t v1; // 0x804a2f0
int32_t v2 = v1 & 0x4500; // 0x804a2fc
printf("FCOM(1,para): should=0x0000 is=0x%04x\n", v2);
__asm_wait();
printf("FCOM(para,1): should=0x0100 is=0x%04x\n", v2);
__asm_wait();
printf("FCOM(pi,1): should=0x0000 is=0x%04x\n", v2);
__asm_wait();
printf("FCOM(1,pi): should=0x0100 is=0x%04x\n", v2);
...
```

The value v2 should change for each printf call. Something is missing here.

Inspect the linked subject.exe and its generated FCOM output, focusing on the FCOM and FTST cases shown in the issue. Compare the emitted code with the expected status values for each printf call. Done means the generated output preserves the differing x87 comparison results instead of reusing an unchanged v2.

Written by the indexing model from the issue text.