[ASan] Use -isysroot instead of -Wl,-syslibroot to link the ASan iossim runtime (-Wl,-syslibroot was accidentally overridden by -isysroot from Clang on OSX 10.9)
[ASan] Use -isysroot instead of -Wl,-syslibroot to link the ASan iossim runtime
(-Wl,-syslibroot was accidentally overridden by -isysroot from Clang on OSX 10.9)

-isysroot is a Clang/LLVM-GCC-specific option, but hosting libsanitizer for LLVM
with GCC on Darwin shouldn't work anyway, because of the missing blocks support.



git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@195132 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