Hamish Knight 58d6694783 Requestify ExportedSourceFile parsing ...

Avoid parsing the syntax tree up-front, and instead
only parse it when required, which happens when either:

1. ASTGen parsing is enabled (currently disabled
   by default)
2. Round trip checking is enabled for a primary
   file (enabled by default in a debug build,
   except when dep scanning or doing an IDE
   operation)
3. We need to evaluate a macro in that file

This change therefore means that we now no longer
need to parse the syntax tree for secondary files
by default unless we specifically need to evaluate
a macro in them (e.g if we need to lookup a member
on a decl with an attached macro). And the same
for primaries in release builds.

rdar://109283847

2023-05-22 14:55:19 +01:00

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