Merge pull request apple#822 from apple/sr-7801-swift-4.2

[4.2] [REPL] Set the correct rpath when installing.

Author: shahmishal

tools/repl/swift/CMakeLists.txt

@@ -5,6 +5,7 @@ if (LLDB_BUILD_FRAMEWORK)
 elseif( CMAKE_SYSTEM_NAME MATCHES "Linux" )
   # Set the correct rpath to locate libswiftCore
   set(CMAKE_EXE_LINKER_FLAGS "-Wl,-rpath,${CMAKE_BINARY_DIR}/../swift-linux-x86_64/lib${LLVM_LIBDIR_SUFFIX}/swift/linux -Wl,-ldl")
+  set(CMAKE_INSTALL_RPATH "$ORIGIN/../lib/swift/linux:${CMAKE_INSTALL_RPATH}")
 endif()
 
 add_lldb_tool(repl_swift