c/10148: [MingW/CygWin] Compiler dumps core

[Giovanni Bajo]

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&p
r=10148

Reduced snippet:
--------------------------------------------
struct Foo
{
    int a;
};

__attribute__((dllimport)) struct Foo f;

void Bar(void)
{
    void* dummy = &f;
}

struct Foo f;

void* dummy = &f;
--------------------------------------------
pr10148.c:16: internal compiler error: Segmentation fault

Confirmed under cygwin with 3.2 and 3.3 20030401.
2.95 can compile the above correctly so it's (at least) a 3.2/3.3
regression.
I can't test with 3.4 (mainline broken for cygwin)

Giovanni