MC: Fix a few more cases we were passing an MCDataFragment when a MCFragment would do, and sprinkle in some const.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99218 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp
index 54510cc..8cb7270 100644
--- a/lib/MC/MCAssembler.cpp
+++ b/lib/MC/MCAssembler.cpp
@@ -234,8 +234,8 @@
   return getAtomForAddress(SD->getFragment()->getParent(), SD->getAddress());
 }
 
-bool MCAssembler::EvaluateFixup(const MCAsmLayout &Layout, MCAsmFixup &Fixup,
-                                MCDataFragment *DF,
+bool MCAssembler::EvaluateFixup(const MCAsmLayout &Layout,
+                                const MCAsmFixup &Fixup, const MCFragment *DF,
                                 MCValue &Target, uint64_t &Value) const {
   if (!Fixup.Value->EvaluateAsRelocatable(Target, &Layout))
     llvm_report_error("expected relocatable expression");
@@ -584,7 +584,8 @@
   OS.flush();
 }
 
-bool MCAssembler::FixupNeedsRelaxation(MCAsmFixup &Fixup, MCDataFragment *DF,
+bool MCAssembler::FixupNeedsRelaxation(const MCAsmFixup &Fixup,
+                                       const MCFragment *DF,
                                        const MCAsmLayout &Layout) const {
   // Currently we only need to relax X86::reloc_pcrel_1byte.
   if (unsigned(Fixup.Kind) != X86::reloc_pcrel_1byte)