Xi Ge 8293bdc9e9 SerilizeLoc: refactor table structures per Jordan's comments ...

After this change, we only use one single hash table for USR to USR id
mapping. The basic source locations are an array of fixed length
records that could be retrieved by using the USR id since each
USR id is guaranteed to be associated with one basic location entry.

The source file paths are refactored to a blob of 0-terminated strings.
Decl locations use offset in this blob to refer to the source file path
where the decl was defined.

2019-10-09 15:29:52 -07:00

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