Add llvm-link and clang to CMake install (#14768)

They are used to generate ukernel bitcode targets. Include the binaries
in the host tool install to support cross-compilation

The binaries will be added as CMake `TARGET` via `iree_import_binary`
for cross-compile flows.

tools/CMakeLists.txt

@@ -40,6 +40,8 @@ if(IREE_HOST_BIN_DIR AND NOT IREE_BUILD_COMPILER)
   iree_import_binary(NAME iree-compile)
   iree_import_binary(NAME iree-opt)
   iree_import_binary(NAME iree-run-mlir)
+  iree_import_binary(NAME clang)
+  iree_import_binary(NAME llvm-link)
 endif()
 
 # TODO(#6353): Tools has thread dependencies in gtest, benchmark, yaml, etc.
@@ -229,6 +231,22 @@ if(IREE_BUILD_COMPILER)
     )
   endif()
 
+  if(IREE_LLVM_LINK_TARGET)
+    install(
+      TARGETS llvm-link
+      COMPONENT Compiler
+      RUNTIME DESTINATION bin
+    )
+  endif()
+
+  if(IREE_CLANG_TARGET)
+    install(
+      TARGETS clang
+      COMPONENT Compiler
+      RUNTIME DESTINATION bin
+    )
+  endif()
+
   # Tablegen binaries are special snowflakes among special snowflakes.
   # They must be statically linked against internal LLVM libraries, and they
   # therefore must not depend on anything outside of the upstream tablegen