[Sanitizers] Add *SAN_OPTIONS to possibly_dangerous_env_vars
[Sanitizers] Add *SAN_OPTIONS to possibly_dangerous_env_vars

Summary:
This way, if they're set when running ninja check-ubsan (or another
sanitizer), they get cleared before we start invoking the programs.

Reviewers: samsonov, kcc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10229

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@238991 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