[UBSan] Allow to override runtime flags defaults by providing compile definition UBSAN_DEFAULT_OPTIONS when building the runtime. This mirrors similar ASan functionality.
[UBSan] Allow to override runtime flags defaults by providing
compile definition UBSAN_DEFAULT_OPTIONS when building the runtime.
This mirrors similar ASan functionality.


git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@214259 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