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Previously type visitation was done strictly sequentially, and TypeIndexes were computed by incrementing the TypeIndex of the last visited record. This works fine for situations like dumping, but not when you want to visit types in random order. For example, in a debug session someone might lookup a symbol by name, find that it has TypeIndex 10,000 and then want to go straight to TypeIndex 10,000. In order to make this work, the visitation framework needs a mode where it can plumb TypeIndices through the callback pipeline. This patch adds such a mode. In doing so, it is necessary to provide an alternative implementation of TypeDatabase that supports random access, so that is done as well. Nothing actually uses these random access capabilities yet, but this will be done in subsequent patches. Differential Revision: https://reviews.llvm.org/D32928 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302454 91177308-0d34-0410-b5e6-96231b3b80d8
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