Remove dependency on MonoTime.ticksPerSecond as it's not always ready.

src/gc/gc.d

@@ -61,7 +61,35 @@ else                   import core.stdc.stdio : sprintf, printf; // needed to ou
 
 import core.time;
 alias currTime = MonoTime.currTime;
-long currTicks() { return MonoTime.ticksPerSecond ? MonoTime.currTime.ticks : 0; }
+debug(PROFILE_API)
+{
+    long currTicks() nothrow @nogc
+    {
+        // MonoTime.ticksPerSecond may not be ready yet. So just avoid it altogether
+        // this is copied from core.time.MonoTime.currTime
+        //return MonoTime.ticksPerSecond ? MonoTime.currTime.ticks : 0;
+        version(Windows)
+        {
+            long ticks;
+            if(QueryPerformanceCounter(&ticks) == 0)
+            {
+                // This probably cannot happen on Windows 95 or later
+                assert(0, "Call to QueryPerformanceCounter failed.");
+            }
+            return ticks;
+        }
+        else version(OSX)
+            return mach_absolute_time();
+        else version(Posix)
+        {
+            timespec ts;
+            if(clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
+                assert(0, "Call to clock_gettime failed.");
+
+            return ts.tv_sec * 1_000_000_000L + ts.tv_nsec;
+        }
+    }
+}
 
 debug(PRINTF_TO_FILE)
 {