[PATCH] Add option for dumping to stderr (issue6190057)

[Sharad Singhai]

In response to the recent comments, I have updated the patch to do the
following:

- Remove pass handling from -fopt-info
- Support additional flags in regular dumps

I have massaged the options so that they have the following (hopefully
clearer) behavior:

gcc ... -fopt-info ....   ---> dump all optimization info on stderr
gcc ... -fopt-info-missed-optimized=file.txt  --> dump info about
optimization applied as well as missed opportunities on to file.txt.
If no file.txt is provided, then use stderr.

I have enhanced regular dump flags, so that values accepted by
-fopt-info are also accepted. For example,
gcc ... -O2 -ftree-vectorize -fdump-tree-vect-optimized=foo.dump

Now foo.dump will include the regular tree-vect dump as well as the
output of -fopt-info=optimized. This way developers can get more
detailed dumps when needed.

I have also changed the meaning of dump option "details" to include
optimization details. Thus "-details" flag implies
"-missed-optimized-note" in addition to other dumps.

The pass level filtering of -fopt-info dumps can be done in a follow
up patch. It may even turn out to be unnecessary, because the
equivalent effect can be achieved by
-ftree-PASS-optimized-missed-note.

I have bootstrapped and tested the attached patch on x86_64 and didn't
observe any new failures. Okay for trunk?

Thanks,
Sharad
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