Steven Wu c7d66b8845 Teach swift to compute cache key for compiler outputs ...

Teach swift how to serialize its input into CAS to create a cache key
for compiler outputs. To compute the cache key for the output, it first
needs to compute a base-key for the compiler invocation. The base key is
computed from: swift compiler version and the command-line arguments for
the invocation.

Each compiler output from swift will gets its own key. The key for the
output is computed from: the base key for the compiler invocation + the
primary input for the output + the output type.

2023-04-24 13:55:38 -07:00

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