[llvm-objdump] Print a blank row at the end of sections

[Higuoxing]

Summary

When using option -x (--all-headers), it will print Sections, Symbol Table, Program Header ...
Sections and Symbol Table will be connected together.

Before:

Sections:
Idx Name          Size      Address          Type
  0               00000000 0000000000000000
  ...
  29 .shstrtab     0000011a 0000000000000000
SYMBOL TABLE:
  ...

After:

Sections:
Idx Name          Size      Address          Type
  0               00000000 0000000000000000
  ...
  29 .shstrtab     0000011a 0000000000000000

SYMBOL TABLE:
  ...

[Higuoxing]

I'm implementing the Version Reference for #30241 and find that some info emitted from option -x are crowded. If this not ok, I will revert this change.

llvm/trunk/tools/llvm-objdump/llvm-objdump.cpp

for (const SectionRef &Section : ToolSectionFilter(*Obj)) {
     bool Data = Section.isData();
     bool BSS = Section.isBSS();
     std::string Type = (std::string(Text ? "TEXT " : "") +
                         (Data ? "DATA " : "") + (BSS ? "BSS" : ""));
     outs() << format("%3d %-13s %08" PRIx64 " %016" PRIx64 " %s\n",
                      (unsigned)Section.getIndex(), Name.str().c_str(), Size,
                      Address, Type.c_str());
   }
+  outs() << "\n";
 }
 
 void llvm::PrintSectionContents(const ObjectFile *Obj) {
   std::error_code EC;
   for (const SectionRef &Section : ToolSectionFilter(*Obj)) {
     StringRef Name;
     StringRef Contents;
     error(Section.getName(Name));