[cmake] tools/swift-reflection-test => stdlib/tools/swift-reflection-test.

If one thinks about it, swift's build has two sections: a runtime or target
section (i.e. ./stdlib) and a host section (everything
else). swift-reflection-test is an abberation from that pattern since it is
built for target platforms but is in the section of host tools.

In this commit, I move it into ./stdlib. Beyond being a bitter location
conceptually this will additionally allow me to avoid a dependency cycle in
between the compiler and the stdlib build.

After this, there is only one more target in the compiler code: swift-lang. From
talking with Xi Ge, we can move that into its own separate project as a
package. Once that is done, I will not have any more cycles.

Author: gottesmm

CMakeLists.txt

@@ -1029,10 +1029,6 @@ endif()
 
 add_subdirectory(utils)
 
-if(SWIFT_BUILD_DYNAMIC_STDLIB AND SWIFT_INCLUDE_TESTS)
-  add_subdirectory(tools/swift-reflection-test)
-endif()
-
 if ("${CMAKE_SYSTEM_NAME}" STREQUAL "Darwin")
   if(SWIFT_BUILD_PERF_TESTSUITE)
     add_subdirectory(benchmark)

stdlib/CMakeLists.txt

@@ -102,4 +102,4 @@ swift_create_stdlib_targets("swift-test-stdlib" "" FALSE)
 
 add_subdirectory(public)
 add_subdirectory(private)
-
+add_subdirectory(tools)

stdlib/tools/CMakeLists.txt

@@ -0,0 +1,3 @@
+if(SWIFT_BUILD_DYNAMIC_STDLIB AND SWIFT_INCLUDE_TESTS)
+  add_subdirectory(swift-reflection-test)
+endif()