[llvm-jitlink] Remove duplicate type defintion (NFC)

Author: weliveindetail

llvm/tools/llvm-jitlink/llvm-jitlink.h

@@ -51,8 +51,6 @@ class LLVMJITLinkObjectLinkingLayer : public orc::ObjectLinkingLayer {
 using LLVMJITLinkChannel = orc::shared::FDRawByteChannel;
 using LLVMJITLinkRPCEndpoint =
     orc::shared::MultiThreadedRPCEndpoint<LLVMJITLinkChannel>;
-using LLVMJITLinkRemoteMemoryManager =
-    orc::OrcRPCTPCJITLinkMemoryManager<LLVMJITLinkRPCEndpoint>;
 using LLVMJITLinkRemoteMemoryAccess =
     orc::OrcRPCTPCMemoryAccess<LLVMJITLinkRPCEndpoint>;