Enable debugging in debug build

Summary:
Enable the preprocessor flag to allow debugging when in a debug build. This flag influences the Hermes headers included in the inspector, and causes them to include the debugging functionality.

Changelog:
    [General][Fixed] - Re-enabled debugging for debug builds

Differential Revision: D47243235

fbshipit-source-id: 3188f04de5eab8b34644a84c93083ea7a016be47

packages/react-native/ReactCommon/hermes/inspector/CMakeLists.txt

@@ -20,6 +20,14 @@ target_compile_options(
  -fexceptions
 )
 
+if(${CMAKE_BUILD_TYPE} MATCHES Debug)
+ target_compile_options(
+ hermes_inspector
+ PRIVATE
+ -DHERMES_ENABLE_DEBUGGER=1
+ )
+endif()
+
 target_include_directories(hermes_inspector PUBLIC ${REACT_COMMON_DIR})
 target_link_libraries(hermes_inspector
  jsinspector