Remove a trivial forwarding function. NFC.

llvm-svn: 238506
diff --git a/llvm/lib/MC/MCExpr.cpp b/llvm/lib/MC/MCExpr.cpp
index 7f048d7..1c0dc3f 100644
--- a/llvm/lib/MC/MCExpr.cpp
+++ b/llvm/lib/MC/MCExpr.cpp
@@ -471,8 +471,8 @@
   if (!Asm->getWriter().IsSymbolRefDifferenceFullyResolved(*Asm, A, B, InSet))
     return;
 
-  const MCSymbolData &AD = Asm->getSymbolData(SA);
-  const MCSymbolData &BD = Asm->getSymbolData(SB);
+  const MCSymbolData &AD = SA.getData();
+  const MCSymbolData &BD = SB.getData();
 
   if (AD.getFragment() == BD.getFragment()) {
     Addend += (AD.getOffset() - BD.getOffset());