Richard Smith 1132c75bd7 Remove vptr dispatch from FoldingSet. ...

Summary:
Instead of storing a vptr in each FoldingSet instance, form an
equivalent struct and pass it implicitly from FoldingSet into the
various FoldingSetBase methods.

This has three benefits:
 * FoldingSet becomes one pointer smaller.
 * Under LTO, the "virtual" functions are much easier to inline.
 * The element type no longer needs to be complete when instantiating
   FoldingSet<T>, only when instantiating an insert / lookup member.

Reviewers: rnk

Subscribers: hiraditya, dexonsmith, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D78247

2020-04-15 17:39:35 -07:00

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