8359497: IllegalArgumentException thrown by SourceCodeAnalysisImpl.highlights()

[lahodaj]

When JShell computes highlights, it uses the javac' lexer to detect keywords. But, if there's a lexical error in the input, the lexer will try to report an error, but that will with an exception, as there's no input file set. This PR:

• sets a source to Log so that the attempt to report the error will not fail
• sets a DiagnosticListener so that the error is ignored (as the error is not important, this lexer is only used to detect keyword).

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Issue

• JDK-8359497: IllegalArgumentException thrown by SourceCodeAnalysisImpl.highlights() (Bug - P4)

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