Symbolication doesn't take advantage of batching when creating builders

[mstange]

For example, re-symbolicating this profile takes too long: https://share.firefox.dev/3TxzHpt

We spend too much time in getRawFrameTableBuilderWithExistingContents. We could be calling it once per batch instead of once per library. Profile: https://share.firefox.dev/3UaE2Pt

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