[PATCH] D120864: [AArch64] Avoid scanning feature list for target parsing

[Son Tuan Vu via Phabricator via cfe-commits]

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As discussed in https://reviews.llvm.org/D120111, this patch proposes an
alternative implementation to avoid scanning feature list for
architecture version over and over again. The insertion position for
default extensions is also captured during this single scan of the
feature list.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D120864

Files:
  clang/lib/Driver/ToolChains/Arch/AArch64.cpp

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