[sanitizier] initializing common flags.
[sanitizier] initializing common flags.

Summary: Without SetDefaults() CommonFlags contain garbage.

Differential Revision: http://reviews.llvm.org/D18326

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@263985 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt