[cmake] Move FindLibcCommonUtils to shared cmake, to fix standalone builds (#131586)

Move `FindLibcCommonUtils` from LLVM's CMake module directory to the
shared top-level CMake directory, as the module is intended to be used
from within the source tree rather than the installed LLVM version. This
fixes standalone offload builds after #131205.

cmake/Modules/FindLibcCommonUtils.cmake

@@ -0,0 +1,19 @@
+#===--------------------------------------------------------------------===//
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for details.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+#===--------------------------------------------------------------------===//
+
+if(NOT TARGET llvm-libc-common-utilities)
+  set(libc_path ${CMAKE_CURRENT_LIST_DIR}/../../libc)
+  if (EXISTS ${libc_path} AND IS_DIRECTORY ${libc_path})
+    add_library(llvm-libc-common-utilities INTERFACE)
+    # TODO: Reorganize the libc shared section so that it can be included without
+    # adding the root "libc" directory to the include path.
+    target_include_directories(llvm-libc-common-utilities INTERFACE ${libc_path})
+    target_compile_definitions(llvm-libc-common-utilities INTERFACE LIBC_NAMESPACE=__llvm_libc_common_utils)
+    target_compile_features(llvm-libc-common-utilities INTERFACE cxx_std_17)
+  endif()
+endif()