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cmd/gc: move large stack variables to heap
Individual variables bigger than 10 MB are now moved to the heap, as if they had escaped on their own. This avoids ridiculous stacks for programs that do things like x := [1<<30]byte{} ... use x ... If 10 MB is too small, we can raise the limit. Fixes #6077. R=ken2 CC=golang-dev https://golang.org/cl/12650045
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