[Issue 6401] infinite loop with -inline in gflow.c:accumaecpx

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=6401

--- Comment #6 from Iain Buclaw <ibuclaw at gdcproject.org> ---
Somewhat reduced test:
---
enum LIBRARY
{
    GTK
}

struct Linker
{
    static void link(T)(ref T funct, string symbol, LIBRARY[] libraries ...)
    {
    }
}

static this()
{
    static foreach(i; 0 .. 10_000)
        Linker.link(somefunc, "somefunc", LIBRARY.GTK);
}

void function() c_somefunc;
alias c_somefunc  somefunc;
---

To prove that this isn't too much of a contrived test, I checked the compile
times of other compilers.

dmd -O -release -inline | 3 minutes 12 seconds.
gdc -O2 -frelease       | 6 seconds.
ldc -O2 -release        | 8 seconds.


Actually, the dmd compiler segfaults, I assume because I managed to hit a stack
overflow.

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