Use CMAKE_INSTALL_BINDIR instead of hardcoding bin for tools install paths

[tkelman]

Summary

This allows customizing the location executables and symlinks get installed to,
as with --bindir in autotools.

[beanz]

LGTM.

Thanks,
-Chris

cmake/modules/AddLLVM.cmake

macro(add_llvm_tool name)
   endif()
   add_llvm_executable(${name} ${ARGN})
 
   list(FIND LLVM_TOOLCHAIN_TOOLS ${name} LLVM_IS_${name}_TOOLCHAIN_TOOL)
   if (LLVM_IS_${name}_TOOLCHAIN_TOOL GREATER -1 OR NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
     if( LLVM_BUILD_TOOLS )
       install(TARGETS ${name}
               EXPORT LLVMExports
-              RUNTIME DESTINATION bin
+              RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
               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")
function(llvm_install_symlink name dest)
   else()
     set(component ${name})
   endif()
 
   set(full_name ${name}${CMAKE_EXECUTABLE_SUFFIX})
   set(full_dest ${dest}${CMAKE_EXECUTABLE_SUFFIX})
 
   install(SCRIPT ${INSTALL_SYMLINK}
-          CODE "install_symlink(${full_name} ${full_dest} bin)"
+          CODE "install_symlink(${full_name} ${full_dest} ${CMAKE_INSTALL_BINDIR})"
           COMPONENT ${component})
 
   if (NOT CMAKE_CONFIGURATION_TYPES AND NOT ARG_ALWAYS_GENERATE)
     add_custom_target(install-${name}
                       DEPENDS ${name} ${dest} install-${dest}
                       COMMAND "${CMAKE_COMMAND}"
                               -DCMAKE_INSTALL_COMPONENT=${name}
                               -P "${CMAKE_BINARY_DIR}/cmake_install.cmake")

cmake/modules/TableGen.cmake

macro(add_tablegen target project)
   if( MINGW )
     if(CMAKE_SIZEOF_VOID_P MATCHES "8")
       set_target_properties(${target} PROPERTIES LINK_FLAGS -Wl,--stack,16777216)
     endif(CMAKE_SIZEOF_VOID_P MATCHES "8")
   endif( MINGW )
   if (${project} STREQUAL LLVM AND NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
     install(TARGETS ${target}
             EXPORT LLVMExports
-            RUNTIME DESTINATION bin)
+            RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
   endif()
   set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS ${target})
 endmacro()