build: allow specifying the component to llvm_install_symlink

Add an optional parameter to `llvm_install_symlink` which allows the symlink
installation to be placed into a specific component rather than the default
value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288600 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/modules/AddLLVM.cmake

@@ -1254,18 +1254,22 @@ function(llvm_install_library_symlink name dest type)
 endfunction()
 
 function(llvm_install_symlink name dest)
-  cmake_parse_arguments(ARG "ALWAYS_GENERATE" "" "" ${ARGN})
+  cmake_parse_arguments(ARG "ALWAYS_GENERATE" "COMPONENT" "" ${ARGN})
   foreach(path ${CMAKE_MODULE_PATH})
     if(EXISTS ${path}/LLVMInstallSymlink.cmake)
       set(INSTALL_SYMLINK ${path}/LLVMInstallSymlink.cmake)
       break()
     endif()
   endforeach()
 
-  if(ARG_ALWAYS_GENERATE)
-    set(component ${dest})
+  if(ARG_COMPONENT)
+    set(component ${ARG_COMPONENT})
   else()
-    set(component ${name})
+    if(ARG_ALWAYS_GENERATE)
+      set(component ${dest})
+    else()
+      set(component ${name})
+    endif()
   endif()
 
   set(full_name ${name}${CMAKE_EXECUTABLE_SUFFIX})