Constant Decompiler Wrong

Hello, I'm using retdec to lift a libssl binary from openssl project by
```
retdec-decompiler libssl.so
```

and I found that the constant value `0x2f8` in function `init_sig_algs` is translated in wrong way.

```asm
libssl.so[0x59480] <+0>: pushq %rbp
libssl.so[0x59481] <+1>: movq %rsp, %rbp
libssl.so[0x59484] <+4>: subq $0x10, %rsp
libssl.so[0x59488] <+8>: movq %rdi, -0x8(%rbp)
libssl.so[0x5948c] <+12>: movl %esi, -0xc(%rbp)
libssl.so[0x5948f] <+15>: movq -0x8(%rbp), %rax
libssl.so[0x59493] <+19>: movq 0xa8(%rax), %rax
libssl.so[0x5949a] <+26>: movq 0x2e8(%rax), %rdi
libssl.so[0x594a1] <+33>: leaq 0x40978(%rip), %rsi
libssl.so[0x594a8] <+40>: movl $0x47f, %edx
libssl.so[0x594ad] <+45>: callq 0x1c950
libssl.so[0x594b2] <+50>: movq -0x8(%rbp), %rax
libssl.so[0x594b6] <+54>: movq 0xa8(%rax), %rax
libssl.so[0x594bd] <+61>: movq $0x0, 0x2e8(%rax)
libssl.so[0x594c8] <+72>: movq -0x8(%rbp), %rax
libssl.so[0x594cc] <+76>: movq 0xa8(%rax), %rax
libssl.so[0x594d3] <+83>: movq $0x0, 0x2f8(%rax) ; **here**
libssl.so[0x594de] <+94>: movl $0x1, %eax
libssl.so[0x594e3] <+99>: addq $0x10, %rsp
libssl.so[0x594e7] <+103>: popq
libssl.so[0x594e8] <+104>: retq
```

The value 0x2f8 should be translated to 760, but I see strange value `0x510084000808890`
```c
int64_t init_sig_algs_cert(int64_t a1, int64_t a2) {
int64_t * v1 = (int64_t *)(a1 + 168); // 0x59403
int64_t v2 = *(int64_t *)(*v1 + (int64_t)&g300); // 0x5940a
int64_t v3; // 0x593f0
CRYPTO_free(v2, "ssl/statem/extensions.c", (int64_t)&g525, v3, v3, v3);
*(int64_t *)(*v1 + (int64_t)&g300) = 0;
*(int64_t *)(*v1 + (int64_t)&g309) = 0; // g309 = 0x510084000808890
return 1;
}
```
I observe the LLVM IR and find that the constant value in IR is already wrong:

```llvm
@global_var_2f8 = global i64 -4539487412014271340
%10 = load i64, i64* %1, align 8
%11 = add i64 %10, ptrtoint (i64* @global_var_2f8 to i64)
%12 = inttoptr i64 %11 to i64*
store i64 0, i64* %12, align 8
```

How can I fix that? Any suggestions will be appreciated!

[libssl.so.zip](https://github.com/avast/retdec/files/15343489/libssl.so.zip)

Start by reproducing the report with retdec-decompiler on the supplied libssl.so.zip and inspect the LLVM IR around global_var_2f8. Compare the generated IR and C output with the assembly for init_sig_algs, especially the 0x2f8 memory offset; done means the offset is represented as 760 and the decompiled store targets the correct field.

Written by the indexing model from the issue text.