fix destructor order to fix build

src/pathops/SkPathOpsOp.cpp

Index: src/pathops/SkPathOpsOp.cpp
diff --git a/src/pathops/SkPathOpsOp.cpp b/src/pathops/SkPathOpsOp.cpp
index 77ae2de778f7bb38c3b688774992108f6d6836fa..3182ac363df1faa089f81b897cde7b8a5449289c 100644
--- a/src/pathops/SkPathOpsOp.cpp
+++ b/src/pathops/SkPathOpsOp.cpp
@@ -261,6 +261,7 @@ static void dump_op(const SkPath& one, const SkPath& two, SkPathOp op) {
 #endif
 
 bool Op(const SkPath& one, const SkPath& two, SkPathOp op, SkPath* result) {
+    SkChunkAlloc allocator(4096);  // FIXME: add a constant expression here, tune
     SkOpContour contour;
     SkOpCoincidence coincidence;
     SkOpGlobalState globalState(&coincidence  PATH_OPS_DEBUG_PARAMS(&contour));
@@ -288,7 +289,6 @@ bool Op(const SkPath& one, const SkPath& two, SkPathOp op, SkPath* result) {
     SkPathOpsDebug::gSortCount = SkPathOpsDebug::gSortCountDefault;
 #endif
     // turn path into list of segments
-    SkChunkAlloc allocator(4096);  // FIXME: add a constant expression here, tune
     SkOpEdgeBuilder builder(*minuend, &contour, &allocator, &globalState);
     if (builder.unparseable()) {
         return false;