[cmake] Install runtime swiftDemangle pieces.

In DLL environments (Windows) a library RUNTIME piece will be the
DLL itself (while the .lib will be the LIBRARY piece). Adding a RUNTIME
destination install swiftDemangle.dll correctly in its expected place.

This was avoiding some tests from running in the Windows CI machines. It
should also allow people use tools like swift-demangle.

Author: drodriguez

lib/SwiftDemangle/CMakeLists.txt

@@ -8,6 +8,9 @@ target_link_libraries(swiftDemangle PRIVATE
 
 add_dependencies(compiler swiftDemangle)
 swift_install_in_component(TARGETS swiftDemangle
+  RUNTIME
+    DESTINATION "bin"
+    COMPONENT compiler
   LIBRARY
     DESTINATION "lib${LLVM_LIBDIR_SUFFIX}"
     COMPONENT compiler