Backport(v1.16) test: improve Sigdump test for Windows (#4847) - #4862
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**Which issue(s) this PR fixes**: None. Related to * #4063 * #4846 **What this PR does / why we need it**: Sigdump.dump iterates ObjectSpace. If there are DoubleDefinition objects of RR, it can set some expectations of RR unexpectedly. It can cause test failure. By doing GC, we can remove DoubleDefinition objects made in other tests. This allows us to simplify this test. See #4063 **Docs Changes**: Not needed. **Release Note**: Not needed. Signed-off-by: Daijiro Fukuda <fukuda@clear-code.com>
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Which issue(s) this PR fixes:
What this PR does / why we need it:
Sigdump.dump iterates ObjectSpace.
If there are DoubleDefinition objects of RR, it can set some expectations of RR unexpectedly.
It can cause test failure.
By doing GC, we can remove DoubleDefinition objects made in other tests. This allows us to simplify this test.
See #4063
Docs Changes:
Not needed.
Release Note:
Not needed.