RISCVAsmBackend: Simplify relaxDwarfCFA

Make it similar to addReloc

Author: MaskRay

llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp

@@ -328,14 +328,8 @@ bool RISCVAsmBackend::relaxDwarfCFA(MCDwarfCallFrameFragment &DF,
   auto AddFixups = [&Fixups, &AddrDelta](unsigned Offset,
                                          std::pair<unsigned, unsigned> Fixup) {
     const MCBinaryExpr &MBE = cast<MCBinaryExpr>(AddrDelta);
-    Fixups.push_back(
-        MCFixup::create(Offset, MBE.getLHS(),
-                        static_cast<MCFixupKind>(FirstLiteralRelocationKind +
-                                                 std::get<0>(Fixup))));
-    Fixups.push_back(
-        MCFixup::create(Offset, MBE.getRHS(),
-                        static_cast<MCFixupKind>(FirstLiteralRelocationKind +
-                                                 std::get<1>(Fixup))));
+    Fixups.push_back(MCFixup::create(Offset, MBE.getLHS(), std::get<0>(Fixup)));
+    Fixups.push_back(MCFixup::create(Offset, MBE.getRHS(), std::get<1>(Fixup)));
   };
 
   if (isUIntN(6, Value)) {