Revert "[MC] Factor MCObjectStreamer::addFragmentAtoms out of MachO streamer."

This reverts rL331412.  We didn't up using fragment atoms
in the wasm object writer after all.

Differential Revision: https://reviews.llvm.org/D48173

llvm-svn: 334734

1 files changed, 0 insertions, 26 deletions

diff --git a/llvm/lib/MC/MCObjectStreamer.cpp b/llvm/lib/MC/MCObjectStreamer.cpp
index 5159cfee7a8..432f4c242a8 100644
--- a/llvm/lib/MC/MCObjectStreamer.cpp
+++ b/llvm/lib/MC/MCObjectStreamer.cpp
@@ -59,32 +59,6 @@ void MCObjectStreamer::flushPendingLabels(MCFragment *F, uint64_t FOffset) {
   PendingLabels.clear();
 }
 
-void MCObjectStreamer::addFragmentAtoms() {
-  // First, scan the symbol table to build a lookup table from fragments to
-  // defining symbols.
-  DenseMap<const MCFragment *, const MCSymbol *> DefiningSymbolMap;
-  for (const MCSymbol &Symbol : getAssembler().symbols()) {
-    if (getAssembler().isSymbolLinkerVisible(Symbol) && Symbol.isInSection() &&
-        !Symbol.isVariable()) {
-      // An atom defining symbol should never be internal to a fragment.
-      assert(Symbol.getOffset() == 0 &&
-             "Invalid offset in atom defining symbol!");
-      DefiningSymbolMap[Symbol.getFragment()] = &Symbol;
-    }
-  }
-
-  // Set the fragment atom associations by tracking the last seen atom defining
-  // symbol.
-  for (MCSection &Sec : getAssembler()) {
-    const MCSymbol *CurrentAtom = nullptr;
-    for (MCFragment &Frag : Sec) {
-      if (const MCSymbol *Symbol = DefiningSymbolMap.lookup(&Frag))
-        CurrentAtom = Symbol;
-      Frag.setAtom(CurrentAtom);
-    }
-  }
-}
-
 // As a compile-time optimization, avoid allocating and evaluating an MCExpr
 // tree for (Hi - Lo) when Hi and Lo are offsets into the same fragment.
 static Optional<uint64_t> absoluteSymbolDiff(const MCSymbol *Hi,