Andrew Kelley 411fcd22ab frontend: rework @embedFile for incremental compilation ...

This feature was made to work with the legacy incremental compilation
mechanism which is being reworked.

This commit regresses the ability to update files used with `@embedFile`
while the compiler is running.

In exchange, we get these benefits:
* The embedded file contents are copied directly into InternPool rather
  than there being an extra allocation and memcpy.
* The EmbedFile struct, which represents a long-lived object, is made
  more serialization friendly.
* Eliminate the creation and use of a Decl as an anonymous decl.

When implementing the new incremental compilation mechanism,
functionality will need to be added back for handling `@embedFile`.

2023-10-23 17:24:58 -07:00

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