CMake: Add LLVM_UTILS_INSTALL_DIR option

[tstellar]

Summary

This is like the LLVM_TOOLS_INSTALL_DIR option, but for the utils
that are installed when the LLVM_INSTALL_UTILS. This option
defaults to 'bin' to remain consistent with the current behavior, but
distros may want to install these to libexec/llvm.

[beanz]

LGTM!

llvm/trunk/CMakeLists.txt

if (CMAKE_BUILD_TYPE AND
   message(FATAL_ERROR "Invalid value for CMAKE_BUILD_TYPE: ${CMAKE_BUILD_TYPE}")
 endif()
 
 set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
 
 set(LLVM_TOOLS_INSTALL_DIR "bin" CACHE STRING "Path for binary subdirectory (defaults to 'bin')")
 mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
 
+set(LLVM_UTILS_INSTALL_DIR "bin" CACHE STRING
+    "Path to install LLVM utilities (enabled by LLVM_INSTALL_UTILS=ON) (defaults to LLVM_TOOLS_INSTALL_DIR)")
+mark_as_advanced(LLVM_TOOLS_INSTALL_DIR)
+
 # They are used as destination of target generators.
 set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
 set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
 if(WIN32 OR CYGWIN)
   # DLL platform -- put DLLs into bin.
   set(LLVM_SHLIB_OUTPUT_INTDIR ${LLVM_RUNTIME_OUTPUT_INTDIR})
 else()
   set(LLVM_SHLIB_OUTPUT_INTDIR ${LLVM_LIBRARY_OUTPUT_INTDIR})

llvm/trunk/cmake/modules/AddLLVM.cmake

macro(add_llvm_utility name)
   if ( NOT LLVM_BUILD_UTILS )
     set(EXCLUDE_FROM_ALL ON)
   endif()
 
   add_llvm_executable(${name} DISABLE_LLVM_LINK_LLVM_DYLIB ${ARGN})
   set_target_properties(${name} PROPERTIES FOLDER "Utils")
   if( LLVM_INSTALL_UTILS AND LLVM_BUILD_UTILS )
     install (TARGETS ${name}
-      RUNTIME DESTINATION bin
+      RUNTIME DESTINATION ${LLVM_UTILS_INSTALL_DIR}
       COMPONENT ${name})
     if (NOT CMAKE_CONFIGURATION_TYPES)
       add_custom_target(install-${name}
                         DEPENDS ${name}
                         COMMAND "${CMAKE_COMMAND}"
                                 -DCMAKE_INSTALL_COMPONENT=${name}
                                 -P "${CMAKE_BINARY_DIR}/cmake_install.cmake")
     endif()