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[obj2yaml] - Fix the issue with dumping empty sections when dumping program headers.
Imagine we have:
```
ProgramHeaders:
- Type: PT_LOAD
Flags: [ PF_W, PF_R ]
Sections:
- Section: .bar
VAddr: 0x2000
Sections:
- Name: .foo
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
Address: 0x1000
- Name: .bar
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
Address: 0x2000
```
Both `.foo` and `.bar` share the same starting file offset,
but `VA(.foo)` < `VA(PT_LOAD)`, we should not include it into segment.
This patch fixes the issue.
Differential revision: https://reviews.llvm.org/D77652