[all-commits] [llvm/llvm-project] 1fa35f: [clang] Avoid recalculating TBAA base type info (#...

[Nathan Sidwell via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1fa35f0b5dc2f3427fbade0eaaca6e2d8c32caef
      https://github.com/llvm/llvm-project/commit/1fa35f0b5dc2f3427fbade0eaaca6e2d8c32caef
  Author: Nathan Sidwell <nathan at acm.org>
  Date:   2023-12-02 (Sat, 02 Dec 2023)

  Changed paths:
    M clang/lib/CodeGen/CodeGenTBAA.cpp

  Log Message:
  -----------
  [clang] Avoid recalculating TBAA base type info (#73264)

As nullptr is a legitimate value, change the BaseTypeMetadataCache hash lookup/insertion to use find and
insert rather than the subscript operator. 

Also adjust getBaseTypeInfoHelper to do no insertion, but let getBaseTypeInfo do that.