merge analyzer errors with static info

[sigmundch]

The idea is that we use the same mechanism to report all errors. Currently analyzer errors don't hold a reference to the AstNode, so the integration is not trivial.

One option is to move away from storing static info per node (just store it by offset & length like the analyzer does). This might be OK since the codegen doesn't need all the static info, just some bits here and there.

[jmesserly]

looking into this as part of analyzer_cli integration. Unclear yet if I'll fix it entirely, but starting to look that way.

[jmesserly]

partially fixed in 0ff64c1 ... testChecker no longer depends on nodes. still more work to do to push it all the way back into CodeChecker

[jmesserly]

https://codereview.chromium.org/1230903002/ fixes most of it.