C PATCH to emit_local_var

[Jason Merrill]

Dealing with temp slots can be expensive in functions with lots of
variables.  Really the data structure needs to be fixed, but this small
optimization can't hurt.

Tested i686-pc-linux-gnu, applied to trunk and tree-ssa.

2003-05-13  Jason Merrill  <jason@redhat.com>

        * c-semantics.c (emit_local_var): Don't mess with temp slots if
        there's no initializer.

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