Stop recursion for create_bundle deps when crossing toolchain.

Only consider the bundle_data target that are defined in the same
toolchain as the create_bundle target in order to allow creation
of multi-arch build using different toolchain.

BUG=603180

Review-Url: https://codereview.chromium.org/2121793003
Cr-Commit-Position: refs/heads/master@{#403832}

tools/gn/target.cc

@@ -515,6 +515,10 @@ void Target::PullRecursiveBundleData() {
     if (pair.ptr->output_type() == CREATE_BUNDLE)
       continue;
 
+    // Don't propagate across toolchain.
+    if (pair.ptr->toolchain() != toolchain())
+      continue;
+
     // Direct dependency on a bundle_data target.
     if (pair.ptr->output_type() == BUNDLE_DATA)
       bundle_data_.AddBundleData(pair.ptr);