[lld][ELF] filter out section symbols when use BP reorder (#151685)

When using Temporal Profiling with the BP algorithm, we encounter an
issue with the internal function reorder. In cases where the symbol
table contains entries like:
```
Symbol table '.symtab' contains 45 entries:
   Num:    Value          Size Type    Bind   Vis       Ndx Name
    10: 0000000000000000     0 SECTION LOCAL  DEFAULT    18 .text.L1
    11: 0000000000000000    24 FUNC    LOCAL  DEFAULT    18 L1
````
The zero-sized section symbol .text.L1 gets stored in the secToSym map
first. However, when the function lookup searches for L1 (as seen in
[BPSectionOrdererBase.inc:191](https://github.com/llvm/llvm-project/blob/main/lld/include/lld/Common/BPSectionOrdererBase.inc#L191)),
it fails to find the correct entry in rootSymbolToSectionIdxs because
the section symbol has already claimed that slot.
This patch fixes the issue by skipping zero-sized symbols during the
addSections process, ensuring that function symbols are properly
registered for lookup.

0 files changed, 0 insertions, 0 deletions