exp/ssa: perform all packages' BUILD phases in parallel.
Details: - move Builder.nTo1Vars into package => thread-safe. - add BuildSerially builder mode flag to disable concurrency. - add Builder.BuildAllPackages method. Benchmark: BuildAllPackages for $GOROOT/test/append.go drops to 83ms from 190ms (GOMAXPROCS=8). R=gri CC=golang-dev https://golang.org/cl/7371051
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