gccint: Dump output verbosity

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1 9.6.4 Dump output verbosity
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1 The dump verbosity has the following options
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1 'optimized'
1      Print information when an optimization is successfully applied.  It
1      is up to a pass to decide which information is relevant.  For
1      example, the vectorizer passes print the source location of loops
1      which got successfully vectorized.
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1 'missed'
1      Print information about missed optimizations.  Individual passes
1      control which information to include in the output.  For example,
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1           gcc -O2 -ftree-vectorize -fopt-info-vec-missed
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1      will print information about missed optimization opportunities from
1      vectorization passes on stderr.
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1 'note'
1      Print verbose information about optimizations, such as certain
1      transformations, more detailed messages about decisions etc.
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1 'all'
1      Print detailed optimization information.  This includes OPTIMIZED,
1      MISSED, and NOTE.
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