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[tree-ssa] Documentation fixes and code cleanup


This is the first of a series of patches to add/update file comments and
do general cleanups of the code.  There are no functionality changes in
this patch.

The main change is the introduction of tree-into-ssa.c and
tree-outof-ssa.c to separate the into/outof SSA passes into independent
files.

The patch also removes some unused variables and data structures, as
well as converting some internal hash tables to use explicit
allocation/deallocation instead of garbage collected memory.

Patch is somewhat large but completely uninteresting.

Bootstrapped and tested x86 and x86-64.


Diego.

Attachment: 20040318-doc-fix.diff.gz
Description: GNU Zip compressed data


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