[LLD] [ELF] Add parentheses to silence a GCC warning. NFC.

This silences the following warning:

../tools/lld/ELF/SyntheticSections.cpp:1596:48: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
 1596 |   assert((index != 0 || type != target->gotRel && type != target->pltRel ||

Differential Revision: https://reviews.llvm.org/D127395

Author: mstorsjo

lld/ELF/SyntheticSections.cpp

@@ -1593,7 +1593,7 @@ uint32_t DynamicReloc::getSymIndex(SymbolTableBaseSection *symTab) const {
     return 0;
 
   size_t index = symTab->getSymbolIndex(sym);
-  assert((index != 0 || type != target->gotRel && type != target->pltRel ||
+  assert((index != 0 || (type != target->gotRel && type != target->pltRel) ||
           !mainPart->dynSymTab->getParent()) &&
          "GOT or PLT relocation must refer to symbol in dynamic symbol table");
   return index;