Cleanup places that passed SMLoc by const reference to pass it by value instead. NFC

llvm-svn: 248135
diff --git a/llvm/lib/Target/AArch64/MCTargetDesc/AArch64ELFStreamer.cpp b/llvm/lib/Target/AArch64/MCTargetDesc/AArch64ELFStreamer.cpp
index 16d5356..caa1cfc 100644
--- a/llvm/lib/Target/AArch64/MCTargetDesc/AArch64ELFStreamer.cpp
+++ b/llvm/lib/Target/AArch64/MCTargetDesc/AArch64ELFStreamer.cpp
@@ -128,8 +128,7 @@
   /// This is one of the functions used to emit data into an ELF section, so the
   /// AArch64 streamer overrides it to add the appropriate mapping symbol ($d)
   /// if necessary.
-  void EmitValueImpl(const MCExpr *Value, unsigned Size,
-                     const SMLoc &Loc) override {
+  void EmitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) override {
     EmitDataMappingSymbol();
     MCELFStreamer::EmitValueImpl(Value, Size);
   }