[CMake] Add install target for LLVMFuzzer

[phosek]

Summary

This allows including LLVMFuzzer as distribution component.

[beanz]

LGTM!

llvm/trunk/lib/Fuzzer/CMakeLists.txt

add_library(LLVMFuzzerNoMain STATIC
       $<TARGET_OBJECTS:LLVMFuzzerNoMainObjects>
       )
   target_link_libraries(LLVMFuzzerNoMain ${LLVM_PTHREAD_LIB})
   add_library(LLVMFuzzer STATIC
       FuzzerMain.cpp
       $<TARGET_OBJECTS:LLVMFuzzerNoMainObjects>
       )
   target_link_libraries(LLVMFuzzer ${LLVM_PTHREAD_LIB})
+
+  if(LLVMFuzzer IN_LIST LLVM_DISTRIBUTION_COMPONENTS OR
+      NOT LLVM_DISTRIBUTION_COMPONENTS)
+    set(export_to_llvmexports EXPORT LLVMExports)
+    set_property(GLOBAL PROPERTY LLVM_HAS_EXPORTS True)
+  endif()
+
+  install(TARGETS LLVMFuzzer
+          ${export_to_llvmexports}
+          ARCHIVE DESTINATION lib${LLVM_LIBDIR_SUFFIX}
+          COMPONENT LLVMFuzzer)
+
+  if (NOT CMAKE_CONFIGURATION_TYPES)
+    add_custom_target(install-LLVMFuzzer
+                      DEPENDS LLVMFuzzer
+                      COMMAND "${CMAKE_COMMAND}"
+                              -DCMAKE_INSTALL_COMPONENT=LLVMFuzzer
+                              -P "${CMAKE_BINARY_DIR}/cmake_install.cmake")
+  endif()
+
+  set_property(GLOBAL APPEND PROPERTY LLVM_EXPORTS LLVMFuzzer)
 endif()
 
 if (MSVC)
 
   # Until bots are reconfigured, check-fuzzer on Windows is a no-OP.
   add_custom_target(check-fuzzer)
   add_custom_command(TARGET check-fuzzer
     COMMAND cmake -E echo "check-fuzzer is disalbed on Windows")
 else()
   if (LLVM_INCLUDE_TESTS AND LIBFUZZER_ENABLE_TESTS)
     add_subdirectory(test)
   endif()
 endif()