misc/cgo/testsanitizers: don't run some TSAN tests on GCC < 7
Before GCC 7 defined __SANITIZE_THREAD__ when using TSAN, runtime/cgo/libcgo.h could not determine reliably whether TSAN was in use when using GCC. Fixes #15983. Change-Id: I5581c9f88e1cde1974c280008b2230fe5e971f44 Reviewed-on: https://go-review.googlesource.com/23833 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
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