hashmap: enforce minimum capacity of 8

[bobzhang]

Single-commit fix for review.

Commit: aa69a12

[coveralls]

Pull Request Test Coverage Report for Build 2190

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.03%) to 92.206%

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Files with Coverage Reduction	New Missed Lines	%
hashmap/hashmap.mbt	3	91.3%

Totals
Change from base Build 2182:	-0.03%
Covered Lines:	9985
Relevant Lines:	10829

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💛 - Coveralls