Alex Rickabaugh 369fd7a540 refactor(compiler): pipeline phase to generate variables (#48580)
This commit implements the first "phase" of the template pipeline. Phases are
individual steps in compilation that perform a transformation of the IR in order
to move closer to generating runtime code for the template.

This first phase is `phaseGenerateVariables()`. This phase introduces variable
definition operations into the IR to define variables in each view. These
variables either represent internal operations (saving/restoring the view
context for listeners, for example) or variables created from user-defined names
such as local references or template context properties.

Every view has all possibly-referenced variables generated, regardless of
whether they're actually referenced by other operations. A future phase will
optimize the variables in each view, inlining those which are only read once and
removing those which are not referenced at all.

PR Close #48580
2023-04-11 11:46:51 -07:00
2023-04-11 10:27:51 -07:00
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