MC: Add MCAssembler::addFixup, which enforces that fixups are added in order.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98379 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCMachOStreamer.cpp b/lib/MC/MCMachOStreamer.cpp
index 1a6fa41..2d833ba 100644
--- a/lib/MC/MCMachOStreamer.cpp
+++ b/lib/MC/MCMachOStreamer.cpp
@@ -327,9 +327,8 @@
     for (unsigned i = 0; i != Size; ++i)
       DF->getContents().push_back(uint8_t(AbsValue >> (i * 8)));
   } else {
-    DF->getFixups().push_back(MCAsmFixup(DF->getContents().size(),
-                                         *AddValueSymbols(Value),
-                                         MCFixup::getKindForSize(Size)));
+    DF->addFixup(MCAsmFixup(DF->getContents().size(), *AddValueSymbols(Value),
+                            MCFixup::getKindForSize(Size)));
     DF->getContents().resize(DF->getContents().size() + Size, 0);
   }
 }
@@ -388,9 +387,8 @@
     DF = new MCDataFragment(CurSectionData);
   for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
     MCFixup &F = Fixups[i];
-    DF->getFixups().push_back(MCAsmFixup(DF->getContents().size()+F.getOffset(),
-                                         *F.getValue(),
-                                         F.getKind()));
+    DF->addFixup(MCAsmFixup(DF->getContents().size()+F.getOffset(),
+                            *F.getValue(), F.getKind()));
   }
   DF->getContents().append(Code.begin(), Code.end());
 }