unittests: Add test for carry inversion bug

unittests/32Bit_ASM/FEX_bugs/InvertedCarrySet.asm

@@ -0,0 +1,27 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RAX": "1"
+  },
+  "Mode": "32BIT"
+}
+%endif
+
+; FEX had a bug where inverting CF to match the ABI when flushing the register cache didn't mark CF as possibly being set.
+; This caused accesses relying on that flag to be set correctly to return wrong values.
+
+mov esp, 0xe0000020
+mov al, 3
+mov cl, 2
+mov ecx, 1
+mov eax, 1
+
+and al, cl ; Zeros CF, non-inverted
+push ecx ; Triggers a register cache flush
+inc eax ; Tries to preserve CF, but would encounter the bug and set it instead
+jnb succ
+mov eax, 0
+hlt
+succ:
+mov eax, 1
+hlt