cmd/compile: Drop references to Prog structs after each function Don't accumulate a massive list of Prog structs during compilation and write them all out at the end of compilation. Instead, convert them to code+relocs (or data+relocs) after each function is compiled. Track down a few other places that were keeping Progs alive and nil them out so the Progs get GCd promptly. Saves ~20% in peak memory usage for the compiler. Surprisingly not much help speed-wise (only because we end up doing more GCs. With a compensating GOGC=120, it does help a bit), but this provides a base for more changes (e.g. reusing a cache of Progs). Change-Id: I838e01017c228995a687a8110d0cd67bf8596407 Reviewed-on: https://go-review.googlesource.com/19867 Run-TryBot: Keith Randall <khr@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com> Reviewed-by: Ian Lance Taylor <iant@golang.org>
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