[sanitizer] Max out allowed macOS deployment targets to 10.9
[sanitizer] Max out allowed macOS deployment targets to 10.9

It's not a good idea to build the sanitizers with e.g. -DCMAKE_OSX_DEPLOYMENT_TARGET=10.12, because some deprecated functions that we intercept will cause build errors. Let's limit the allowed deployment targets to 10.9 (which is the default anyway), and warn when it's set above.

Differential Revision: https://reviews.llvm.org/D26557



git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@286859 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