Enable -msan if available #131
Description
After #123 is fixed and #121 and go-clang/bootstrap#11 are merged, enable -msan if it is available for the Clang version, that is >= 3.8
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After #123 is fixed and #121 and go-clang/bootstrap#11 are merged, enable -msan if it is available for the Clang version, that is >= 3.8