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This is a port of https://golang.org/cl/18150 to the gccgo runtime. The previous behaviour of installing the signal handlers in a separate thread meant that Go initialization raced with non-Go initialization if the non-Go initialization also wanted to install signal handlers. Make installing signal handlers synchronous so that the process-wide behavior is predictable. Reviewed-on: https://go-review.googlesource.com/19494 From-SVN: r233393
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