Updates symbol table entries for all the {@link ICompilationUnit}s in the specified map and unlocks the lock acquired by calling {@link #startIdleState()}.
@param cusToUpdate {@link Map} from {@link ICompilerProject} to{@link Set} of {@link ICompilationUnit}s in the project whose externally visible symbols need to be re-registered with the symbol table of the containing {@link ICompilerProject}.
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