cmd/compile: add control flow graphs to ssa.html
This CL adds CFGs to ssa.html. It execs dot to generate SVG, which then gets inlined into the html. Some standard naming and javascript hacks enable integration with the rest of ssa.html. Clicking on blocks highlights the relevant part of the CFG, and vice versa. Sample output and screenshots can be seen in #28177. CFGs can be turned on with the suffix mask: :* - dump CFG for every phase :lower - just the lower phase :lower-layout - lower through layout :w,x-y - phases w and x through y Calling dot after every pass is noticeably slow, instead use the range of phases. Dead blocks are not displayed on CFG. User can zoom and pan individual CFG when the automatic adjustment has failed. Dot-related errors are reported without bringing down the process. Fixes #28177 Change-Id: Id52c42d86c4559ca737288aa10561b67a119c63d Reviewed-on: https://go-review.googlesource.com/c/142517 Run-TryBot: Yury Smolsky <yury@smolsky.by> Reviewed-by:David Chase <drchase@google.com>
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