Fix removeZeroSequences

[neverwin]

Please review.

[PeterMatula]

Thanks for the improvement. It looks like regression tests do not mind -- no test failed. However, before I merge this, would you be able to provide an example in which this change helped? I guess you have a reason for the change and it would be ideal to test the improvement in our test suite. If this has an effect on some tests in our regression tests, all the better. I could just add another check to an already existing test case.

[neverwin]

This improves decoding for some binary. Here's a minimal example:

b label
.skip 0x100
label: lui $sp, 0x1000

llvm-mc -arch mipsel -filetype=obj bug.s -o bug.o
retdec-decompiler bug.o

[neverwin]

Buggy Result:

0x0:     41 00 00 10   	b 0x108
0x4:     00 00 00 00   	nop 
; data inside code section at 0x8 -- 0x10c
0x8:     00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x18:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x28:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x38:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x48:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x58:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x68:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x78:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x88:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x98:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0xa8:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0xb8:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0xc8:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0xd8:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0xe8:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0xf8:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x108:   00 10 1d 3c                                        |...<            |

Correct Result:

0x0:     41 00 00 10   	b 0x108 <function_0+0x108>
0x4:     00 00 00 00   	nop 
; data inside code section at 0x8 -- 0x108
0x8:     00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x18:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x28:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x38:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x48:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x58:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x68:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x78:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x88:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x98:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0xa8:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0xb8:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0xc8:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0xd8:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0xe8:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0xf8:    00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00   |................|
0x108:   00 10 1d 3c   	lui $sp, 0x1000