Fix a couple of compiler bugz

[vyzo]

A couple of issues discovered following ssxi errors during incremental compilation:

• The ssxi declaration for lambdas that had a hand-written inline rule were broken
• When loading an ssxi, bind a method should be idempotent, ie binding to the same symbol should be allowed.
  As it was it would cause errors during incremental compilation

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[fare]

I don't understand much of it, but it doesn't look dangerous, and if it fixes things, then great.

Test case, though?

[fare]

LGTM if an issue is created to add a test that indeed breaks at v0.18.1-47-gb409070e

[vyzo]

Added the general issue in #1142, which is a MUST before we call it production ready.

[vyzo]

Also commented on the issue to remember this particular pr.