[ESI Runtime] Fixing tests and in-tree builds

RPATH wasn't effective for CIRCT-rooted builds, leading to test and stub
generation failures. Also, one of the tests wasn't updated to a new
name.

integration_test/Dialect/ESI/runtime/loopback.mlir.py

@@ -7,7 +7,7 @@
 platform = sys.argv[1]
 acc = esiaccel.AcceleratorConnection(platform, sys.argv[2])
 
-hostmem = acc.get_host_memory()
+hostmem = acc.get_service_hostmem()
 if hostmem is not None:
   mem1 = hostmem.allocate(1024)
   assert mem1.size == 1024

lib/Dialect/ESI/runtime/CMakeLists.txt

@@ -31,7 +31,8 @@ set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED YES)
 set(CMAKE_INSTALL_RPATH "$ORIGIN/../lib")
 set(CMAKE_INSTALL_RPATH_USE_LINK_PATH FALSE)
-set(CMAKE_BUILD_RPATH "$ORIGIN/../lib")
+set(CMAKE_BUILD_RPATH
+      "${CMAKE_BUILD_RPATH}:${CMAKE_BINARY_DIR}/lib:$ORIGIN/../lib")
 
 # JSON parser for the manifest.
 if (NOT TARGET nlohmann_json)
@@ -274,10 +275,10 @@ if(Python3_FOUND)
       add_custom_command(
           TARGET esiCppAccel
           POST_BUILD
-          COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}"
+          COMMAND ${CMAKE_COMMAND} -E env "PYTHONPATH=${CMAKE_CURRENT_BINARY_DIR}/python"
               python -m pybind11_stubgen 
                 -o "${CMAKE_CURRENT_BINARY_DIR}/python/esiaccel"
-                esiCppAccel
+                esiaccel.esiCppAccel
       )
     else()
       message(STATUS "pybind11_stubgen not found. Skipping stub generation.")