Fix minor heap size calculation
Fix minor heap size calculation

Summary:
The code to set the minor heap size confused bytes and words, and so was
off by a factor 8.  Fortunately it attempted to set the minor heap to
1MB and got the better value of 8MB instead.

Reviewed By: cristianoc

Differential Revision: D3455937

fbshipit-source-id: 48d0e23

kageiit/infer,jvillard/infer,xennygrimmato/infer,jvillard/infer,ropas/infer,ropas/infer,ropas/infer,blzq/infer,kageiit/infer,ryoon/infer,xennygrimmato/infer,jvillard/infer,jsachs/infer,kageiit/infer,facebook/infer,blzq/infer,jsachs/infer,ryoon/infer,facebook/infer,facebook/infer,kageiit/infer,jsachs/infer,jsachs/infer,kageiit/infer,ryoon/infer,kageiit/infer,ropas/infer,facebook/infer,jvillard/infer,facebook/infer,ryoon/infer,ropas/infer,blzq/infer,ropas/infer,xennygrimmato/infer,xennygrimmato/infer,xennygrimmato/infer,blzq/infer,facebook/infer,blzq/infer,blzq/infer,kageiit/infer,jsachs/infer,ryoon/infer,jvillard/infer,xennygrimmato/infer,jvillard/infer,ryoon/infer,xennygrimmato/infer,facebook/infer,jsachs/infer,jvillard/infer