runtime: disable TestParForParallel for now on 32-bit hosts Also add call to GC() to make it easier to re-enable the test.
runtime: disable TestParForParallel for now on 32-bit hosts
Also add call to GC() to make it easier to re-enable the test.

Update issue 4155.
When we have precise GC merged, re-enable this test.

R=golang-dev, bradfitz
CC=golang-dev
http://codereview.appspot.com/6622058

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