#2760 mcs51 link-time failure on new test case.

[Philipp Klaus Krause]

The recently introduced regression test bug-2756.c fails to link for mcs51 in the large and huge models.

To reproduce, enable the test case for these targets.

Philipp

[Maarten Brock]

Even though the source code is valid C, its effect is undefined with all those uninitilized locals. And when 'foundfiles' is initialized the problem goes away.

int m()
{
    int foundfiles /* = 0 */ ;
    if (...)
        foundfiles++;
    if (!foundfiles)
        ....
}

Lowering priority as it only occurs for flawd code.