[tuples] Fix some build warnings

["Diego Novillo" <dnovillo at google dot com>]

We build --disable-bootstrap with -Werrors, which triggers some
spurious warnings when using an old compiler.  This patch fixes some
real warnings and silences false positives in Makefile.in

Tested on x86.


Diego.


2008-01-30  Diego Novillo  <dnovillo@google.com>

        * tree-into-ssa.c (compute_global_livein): Initialize
        PHI with call to gsi_stmt.
        (rewrite_update_init_block): Likewise.
        * tree-complex.c (expand_complex_comparison): Initialize
        TYPE.
        (expand_complex_operations_1): Initialize BR and BI.
        * ebitmap.h (ebitmap_iter_init): Initialize OURN.
        * Makefile.in (dse.o-warn, ebitmap.o-warn,
        lower-subreg.o-warn, tree-chrec.o-warn, varasm.o-warn):
        New.

Attachment: 20080130-fix-warnings.diff.txt
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