[CMake] Quick-Fix targets don't exist when building against LLVM install-tree with LLDB_INCLUDE_TESTS=ON

[sgraenitz]

Summary

The issue came up during release testing for LLVM 8: https://bugs.llvm.org/show_bug.cgi?id=40443

[mgorny]

WFM. A number of tests fail but that's entirely normal at this point and we basically stopped caring.

cmake/modules/AddLLDB.cmake

if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY OR ${name} STREQUAL "liblldb")
       endif()
     endif()
   endif()
 
 
   # Hack: only some LLDB libraries depend on the clang autogenerated headers,
   # but it is simple enough to make all of LLDB depend on some of those
   # headers without negatively impacting much of anything.
+  if(NOT LLDB_BUILT_STANDALONE)
     add_dependencies(${name} clang-tablegen-targets)
+  endif()
 
   # Add in any extra C++ compilation flags for this library.
   target_compile_options(${name} PRIVATE ${PARAM_EXTRA_CXXFLAGS})
 
   set_target_properties(${name} PROPERTIES FOLDER "lldb libraries")
 endfunction(add_lldb_library)
 
 function(add_lldb_executable name)

lit/CMakeLists.txt

list(APPEND LLDB_TEST_DEPS
   LLDBUnitTests
   dsymutil
   llc
   lldb
   lldb-test
   llvm-config
   llvm-mc
   llvm-objcopy
-  FileCheck
-  count
-  not
   )
 
 if(TARGET lld)
   list(APPEND LLDB_TEST_DEPS lld)
 endif()
 
 # the value is not canonicalized within LLVM
 llvm_canonicalize_cmake_booleans(
configure_lit_site_cfg(
   ${CMAKE_CURRENT_SOURCE_DIR}/Unit/lit.site.cfg.py.in
   ${CMAKE_CURRENT_BINARY_DIR}/Unit/lit.site.cfg.py
   MAIN_CONFIG
   ${CMAKE_CURRENT_SOURCE_DIR}/Unit/lit.cfg.py)
 configure_lit_site_cfg(
   ${CMAKE_CURRENT_SOURCE_DIR}/Suite/lit.site.cfg.in
   ${CMAKE_CURRENT_BINARY_DIR}/Suite/lit.site.cfg)
 
+if(NOT LLDB_BUILT_STANDALONE)
+  list(APPEND LLDB_TEST_DEPS
+    FileCheck
+    count
+    not
+  )
+endif()
+
 add_lit_testsuite(check-lldb-lit "Running lldb lit test suite"
   ${CMAKE_CURRENT_BINARY_DIR}
   DEPENDS ${LLDB_TEST_DEPS}
   )
 
 set_target_properties(check-lldb-lit PROPERTIES FOLDER "LLDB tests")
 
 # If we're building with an in-tree clang, then list clang as a dependency