cmd/asm, go/build: invoke cmd/asm only once per package
Prior to this CL, cmd/go invoked cmd/asm once for every assembly file. The exec and cmd/asm startup overhead dwarfed the actual time spent assembling. This CL adds support to cmd/asm to process multiple input files and uses it in cmd/go. This cuts 10% off the wall time for 'go build -a math'. Fixes #15680 Change-Id: I12d2ee2c817207954961dc8f37b8f2b09f835550 Reviewed-on: https://go-review.googlesource.com/27636 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Rob Pike <r@golang.org>
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