[PATCH] D151936: [FuzzMutate] Handle BB with no predecessor and avoid insertion after `musttail call`

[Henry Yu via Phabricator via llvm-commits]

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This patch fixes 2 bugs:

- Add null check when encountering basic blocks without predecessor to avoid segmentation fault
- Avoid insertion after `musttail call` instruction


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151936

Files:
  llvm/lib/FuzzMutate/IRMutator.cpp
  llvm/lib/FuzzMutate/RandomIRBuilder.cpp
  llvm/unittests/FuzzMutate/RandomIRBuilderTest.cpp
  llvm/unittests/FuzzMutate/StrategiesTest.cpp

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