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Fix fetching the architecture of the target on process launch

Authored by tberghammer on Mar 13 2015, 3:32 AM.

Description

Fix fetching the architecture of the target on process launch

Previously it was fetched only if the architecture isn't valid, but the
architecture can be valid without containing all information about the
current target (e.g. missing os).

Differential revision: http://reviews.llvm.org/D8057

llvm-svn: 232153