Add Python 3.6 and 3.7 to the version list

[cbiesinger]

Summary

Python 3.6 and 3.7 have been released.

[amccarth]

Be aware that Swig 3.0.12 has a compatibility problem with Python 3.7 that causes hundreds of LLDB tests to fail an assertion (at least on Windows).

http://lists.llvm.org/pipermail/lldb-dev/2019-June/015086.html

I don't think that should block the patch or whether it even warrants a comment, but it seems worth mentioning somewhere for anyone who goes searching for the cause of the failure.

[cbiesinger]

Thanks Greg! I'm not a committer -- how do I get this committed?

lldb/trunk/cmake/modules/LLDBStandalone.cmake

if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
   list(APPEND CMAKE_MODULE_PATH "${LLVM_DIR}")
   include(AddLLVM)
   include(TableGen)
   include(HandleLLVMOptions)
   include(CheckAtomic)
   include(LLVMDistributionSupport)
 
   if (PYTHON_EXECUTABLE STREQUAL "")
-    set(Python_ADDITIONAL_VERSIONS 3.5 3.4 3.3 3.2 3.1 3.0 2.7 2.6 2.5)
+    set(Python_ADDITIONAL_VERSIONS 3.7 3.6 3.5 3.4 3.3 3.2 3.1 3.0 2.7 2.6 2.5)
     include(FindPythonInterp)
     if( NOT PYTHONINTERP_FOUND )
       message(FATAL_ERROR
               "Unable to find Python interpreter, required for builds and testing.
                Please install Python or specify the PYTHON_EXECUTABLE CMake variable.")
     endif()
   else()
     message(STATUS "Found PythonInterp: ${PYTHON_EXECUTABLE}")