[ELF] - Eliminate dead code. NFC.

Code was dead because at the moment of BssSection creation
it can never have a parent. Also, code simply does not
make sence as alignment adjastment happens when
BssSection is added to its parent later.

llvm-svn: 337276

lld/ELF/SyntheticSections.cpp

@@ -328,8 +328,6 @@ void BuildIdSection::computeHash(
 BssSection::BssSection(StringRef Name, uint64_t Size, uint32_t Alignment)
     : SyntheticSection(SHF_ALLOC | SHF_WRITE, SHT_NOBITS, Alignment, Name) {
   this->Bss = true;
-  if (OutputSection *Sec = getParent())
-    Sec->Alignment = std::max(Sec->Alignment, Alignment);
   this->Size = Size;
 }