JVM crash on large polyfills

首先在 TestH3Core.java 中使用大型 polyfill 用例重现崩溃，然后将其与相关的 testPolyfill.c 用例和 h3Api.polyfill 调用进行比较。确定故障是在 Java wrapper 中还是在 core library 中，并通过针对大型多边形的回归测试确认修复已完成。

When the following is added to TestH3Core.java, the jvm crashes out on h3Api.polyfill before completing the tests. The polyfill works at resolution 9.

    @Test
    public void testPolyfillLarge() {
        List<Long> hexagons = h3.polyfill(
                ImmutableList.<GeoCoord>of(
                        new GeoCoord(41.5, -70.4),
                        new GeoCoord(41.5, -69.8),
                        new GeoCoord(42.1, -69.8),
                        new GeoCoord(42.1, -70.4)
                ), null,
                10
        );

        assertTrue(hexagons.size() > 1000);
    }

Is this an issue with the java wrapper, or is this impossible to do with the core library?

I don't know C but adding a similar test to h3 naively copying the existing styles to testPolyfill.c at level 11 still seems to work. If I increase the resolution up past 11 it eventually segfaults there too.

GeoCoord capeCodVerts[] = {
        {0.7243116395776468, -1.2287117934040082},  {0.7243116395776468, -1.218239817892042},
        {0.7347836150896128, -1.218239817892042}, {0.7347836150896128, -1.2287117934040082}};
Geofence capeCodGeofence;
GeoPolygon capeCodGeoPolygon;

capeCodGeofence.numVerts = 4;
capeCodGeofence.verts = capeCodVerts;
capeCodGeoPolygon.geofence = capeCodGeofence;
capeCodGeoPolygon.numHoles = 0;

TEST(polyfillLarge) {
    int numHexagons = H3_EXPORT(maxPolyfillSize)(&capeCodGeoPolygon, 12);
    H3Index* hexagons = calloc(numHexagons, sizeof(H3Index));

    H3_EXPORT(polyfill)(&capeCodGeoPolygon, 11, hexagons);
    int actualNumHexagons = 0;
    for (int i = 0; i < numHexagons; i++) {
        if (hexagons[i] != 0) {
            actualNumHexagons++;
        }
    }
    
    t_assert(actualNumHexagons > 10000, "got lots of hexagons");
    free(hexagons);
}