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preparing patch for IPCP merge to SSA

Hi,

This patch is a preceding patch to IPCP merge to SSA.

It includes:

1. Creating a new function, get_last_funcdef_no() that returns the value 
    of funcdef_no, and increases it by one.
    The newly allocated function in initialize_cfun uses it to get a new 
funcdef_no .
2. Cleanup in tree_function_versioning.

Thanks to Jan for his help.

Bootstrapped and tested on i686 Linux.
Bootstrapped and tested on ppc Linux.

Ok for mainline?

Thanks,
Razya

Changelog:

        * function.c (get_last_funcdef_no): New function.
          * function.h (get_last_funcdef_no): Declare. 
        * tree-inline.c (initialize_cfun): Add initialization.

Attachment: ssa.diff
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