[Bug]: modules cancatenation causes hash instability

[xusd320]

Build examples/with-umi twice, compare entry chunk:

[stormslowly]

We should compare the compiled js with non-minify first, those files should be no difference between different builds

[xusd320]

We should compare the compiled js with non-minify first, those files should be no difference between different builds

The only difference happens here.

[xusd320]

@stormslowly module concatenation change the codes orders when build redux-saga.
Disable module concatenation, the hash will be stable.

[stormslowly]

oh, my bad

[stormslowly]

close by #1564