docstore/driver: Tests fail on 32 bits arches

[eclipseo]

With Go 1.13 on i686 and armv7hl, gocloud 0.17.0:

gocloud.dev/docstore/driver
# gocloud.dev/docstore/driver [gocloud.dev/docstore/driver.test]
./compare_test.go:75:8: constant 9223372036854775807 overflows int
./compare_test.go:78:8: constant 9223372036854775807 overflows int
./compare_test.go:78:33: constant 9223372036854775806 overflows int
./compare_test.go:79:8: constant 9223372036854775807 overflows int
./compare_test.go:80:8: constant 9223372036854775807 overflows int
./compare_test.go:83:8: constant 9223372036854775807 overflows int
./compare_test.go:84:8: constant -9223372036854775808 overflows int
FAIL	gocloud.dev/docstore/driver [build failed]

[vangent]

@eclipseo , could you patch the PR and see if that fixes it?

[eliben]

@eclipseo could you please test the fix in #2678?

If you no longer care about this issue, please let us know and we'll close it.

[QuLogic]

There is another failure after applying the above patch:

gocloud.dev/docstore/gcpfirestore
# gocloud.dev/docstore/gcpfirestore [gocloud.dev/docstore/gcpfirestore.test]
./query_test.go:153:3: constant 9223372036854775807 overflows int
FAIL	gocloud.dev/docstore/gcpfirestore [build failed]

[QuLogic]

Applying a similar patch to that last file works on armv7hl and i686.

[vangent]

OK, I updated the PR with a fix for gcpfirestore/query_test.go:153.