MC: Clean up method names in MCContext.

The naming was a mish-mash of old and new style. Update to be consistent
with the new. NFC.

llvm-svn: 237594
diff --git a/llvm/lib/MC/MCExpr.cpp b/llvm/lib/MC/MCExpr.cpp
index 7e10387..01a6366 100644
--- a/llvm/lib/MC/MCExpr.cpp
+++ b/llvm/lib/MC/MCExpr.cpp
@@ -164,7 +164,7 @@
 
 const MCSymbolRefExpr *MCSymbolRefExpr::Create(StringRef Name, VariantKind Kind,
                                                MCContext &Ctx) {
-  return Create(Ctx.GetOrCreateSymbol(Name), Kind, Ctx);
+  return Create(Ctx.getOrCreateSymbol(Name), Kind, Ctx);
 }
 
 StringRef MCSymbolRefExpr::getVariantKindName(VariantKind Kind) {