Allow the path to the compiler to have spaces in it when running python test suite

[zturner]

Summary

On Windows, the path to the compiler almost always contains a space. Previously, we would just replace all spaces with semicolons to build a CMake list. This patch changes the CMake to not do this replacement in the compiler path.

[tfiala]

This looks reasonable. I'll give it a run over here...

[tfiala]

LGTM. Came back clean on Linux x86_64 cmake, Ubuntu 14.04 LTS, cmake-built lldb and cmake for test run compiler.

[zturner]

I'm going to hold off on submitting this. I had forgotten about it, and I
now have a better idea about how to solve the problem. I want to change
the command line format of dosep.py so that it doesn't take an argument of
the form -o "<command line for dotest.py>" and instead take a -- separator,
and everything after the -- is the command line to pass to dotest.py. This
way there's no need to escape the quotes.

If this turns out to be difficult or annoying I may revisit this patch and
submit it.

[zturner]

Abandoning this revision since it seems to be heading in the wrong direction. Will address this in a different way in the future.

test/CMakeLists.txt

 function(add_python_test_target name test_script args comment)
   set(PYTHON_TEST_COMMAND
     ${PYTHON_EXECUTABLE}
     ${test_script}
     ${args}
     )
 
   add_custom_target(${name}
     COMMAND ${PYTHON_TEST_COMMAND} ${ARG_DEFAULT_ARGS}
     COMMENT "${comment}"
     )
 endfunction()
 
-string(REGEX REPLACE ".*ccache\ +" "" LLDB_TEST_COMPILER ${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1})
+string(REGEX REPLACE ".*ccache\ +" "" LLDB_TEST_COMPILER \"${CMAKE_C_COMPILER}\" ${CMAKE_C_COMPILER_ARG1})
 
 # Users can override LLDB_TEST_ARGS to modify the way LLDB tests are run. See help below.
-set(LLDB_TEST_ARGS
-  -C
-  ${LLDB_TEST_COMPILER}
-  CACHE STRING "Specify compiler(s) and architecture(s) with which run LLDB tests. For example: '-C gcc -C clang -A i386 -A x86_64'"
-  )
-string(REPLACE " " ";" LLDB_TEST_ARGS ${LLDB_TEST_ARGS})
+STRING(REGEX REPLACE "\"" "\\\\\"" LLDB_TEST_ARGS "-C;${LLDB_TEST_COMPILER}")
 
 set(LLDB_TRACE_DIR "${CMAKE_BINARY_DIR}/lldb-test-traces"
   CACHE STRING "Set directory to output LLDB test traces (for tests that do not pass.)"
   )
 
 set(LLDB_COMMON_TEST_ARGS
   --executable
   ${CMAKE_BINARY_DIR}/bin/lldb${CMAKE_EXECUTABLE_SUFFIX}