[lldb][Bazel] Add missing dependency.

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Differential Revision: https://phabricator.intern.facebook.com/D60251491

Author: akuegel

utils/bazel/llvm-project-overlay/lldb/BUILD.bazel

@@ -697,6 +697,7 @@ cc_library(
         ":TargetHeaders",
         ":TargetProperties",
         ":Utility",
+        "//clang:codegen",
         "//lldb/source/Plugins:PluginProcessUtility",
         "//llvm:BinaryFormat",
         "//llvm:MC",