The fragment implies the section, don't store both.

This reduces MCSymbol from 64 to 56 bytes on x86_64.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238747 91177308-0d34-0410-b5e6-96231b3b80d8

lib/MC/MCAssembler.cpp

@@ -579,6 +579,16 @@ static void writeFragmentContents(const MCFragment &F, MCObjectWriter *OW) {
   OW->WriteBytes(EF.getContents());
 }
 
+void MCAssembler::registerSymbol(const MCSymbol &Symbol, bool *Created) {
+  bool New = !Symbol.isRegistered();
+  if (Created)
+    *Created = New;
+  if (New) {
+    Symbol.setIsRegistered(true);
+    Symbols.push_back(&Symbol);
+  }
+}
+
 void MCAssembler::writeFragmentPadding(const MCFragment &F, uint64_t FSize,
                                        MCObjectWriter *OW) const {
   // Should NOP padding be written out before this fragment?

lib/MC/MCELF.cpp

@@ -13,6 +13,7 @@
 
 #include "llvm/MC/MCELF.h"
 #include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCSymbol.h"
 #include "llvm/MC/MCELFSymbolFlags.h"
 #include "llvm/MC/MCFixupKindInfo.h"
 #include "llvm/Support/ELF.h"

lib/MC/MCMachOStreamer.cpp

@@ -419,11 +419,11 @@ void MCMachOStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
   if (ByteAlignment != 1)
     new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, Section);
 
+  AssignSection(Symbol, Section);
+
   MCFragment *F = new MCFillFragment(0, 0, Size, Section);
   Symbol->setFragment(F);
 
-  AssignSection(Symbol, Section);
-
   // Update the maximum alignment on the zero fill section if necessary.
   if (ByteAlignment > Section->getAlignment())
     Section->setAlignment(ByteAlignment);

lib/MC/MCSymbol.cpp

@@ -42,7 +42,8 @@ void MCSymbol::setVariableValue(const MCExpr *Value) {
   assert(!IsUsed && "Cannot set a variable that has already been used.");
   assert(Value && "Invalid variable value!");
   this->Value = Value;
-  this->Section = nullptr;
+  Section = nullptr;
+  HasFragment = false;
 }
 
 void MCSymbol::print(raw_ostream &OS) const {