[PATCH] D123497: [ValueTracking] Make getStringLenth aware of strdup

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During strlen compile-time evaluation, make it possible to track size of
strduped strings.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123497

Files:
  llvm/include/llvm/Analysis/ValueTracking.h
  llvm/lib/Analysis/MemoryBuiltins.cpp
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
  llvm/test/Transforms/InstCombine/strlen-1.ll

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