sym_push2 optimized for the local_stack case.

    A constant expression removed from the loop.
    If subroutine have 50000+ local variables, then currently
    compilation of such code takes obly 15 sec. Was 2 min.
    gcc-4.1.2 compiles such code in 7 sec. pcc -- 3.44 min.

    A test generator:
    #include <stdio.h>
    int main() {
        puts("#include <stdio.h>"); puts("int main()"); puts("{");
        for (int i = 0; i < 50000; ++i) printf("int X%d = 1;\n", i);
        for (int i = 0; i < 50000; ++i) puts("scanf(\"%d\", &X0);");
        puts("}");
        return 0;
    }

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