[clang] [LifetimeSafety] Revamp test suite using unittests (PR #149158)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-x86_64-linux-abi-test` running on `sie-linux-worker2` while building `clang` at step 6 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/8/builds/18496

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (build-unified-tree) failure: build (failure)
...
  255 |   virtual bool visitInputFile(StringRef FilenameAsRequested, StringRef Filename,
      |                ^~~~~~~~~~~~~~
/home/buildbot/buildbot-root/abi-test/llvm/clang/include/clang/Serialization/ASTReader.h:319:8: note:   by ‘virtual bool clang::ChainedASTReaderListener::visitInputFile(llvm::StringRef, bool, bool, bool)’
  319 |   bool visitInputFile(StringRef Filename, bool isSystem,
      |        ^~~~~~~~~~~~~~
206.404 [1371/10/5894] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/BitfieldInitializer.cpp.o
206.778 [1370/10/5895] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/Attr.cpp.o
206.836 [1369/10/5896] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CallbacksLeaf.cpp.o
206.838 [1368/10/5897] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CallbacksUnaryOperator.cpp.o
206.896 [1367/10/5898] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/LifetimeSafetyTest.cpp.o
FAILED: tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/LifetimeSafetyTest.cpp.o 
/opt/ccache/bin/g++ -DEXPERIMENTAL_KEY_INSTRUCTIONS -DGTEST_HAS_RTTI=0 -DLLVM_BUILD_STATIC -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/buildbot/buildbot-root/abi-test/build/tools/clang/unittests -I/home/buildbot/buildbot-root/abi-test/llvm/clang/unittests -I/home/buildbot/buildbot-root/abi-test/llvm/clang/include -I/home/buildbot/buildbot-root/abi-test/build/tools/clang/include -I/home/buildbot/buildbot-root/abi-test/build/include -I/home/buildbot/buildbot-root/abi-test/llvm/llvm/include -I/home/buildbot/buildbot-root/abi-test/llvm/clang/unittests/Tooling -I/home/buildbot/buildbot-root/abi-test/llvm/third-party/unittest/googletest/include -I/home/buildbot/buildbot-root/abi-test/llvm/third-party/unittest/googlemock/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -O3 -DNDEBUG  -Wno-variadic-macros -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -Wno-suggest-override -std=c++17 -MD -MT tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/LifetimeSafetyTest.cpp.o -MF tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/LifetimeSafetyTest.cpp.o.d -o tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Analysis/LifetimeSafetyTest.cpp.o -c /home/buildbot/buildbot-root/abi-test/llvm/clang/unittests/Analysis/LifetimeSafetyTest.cpp
/home/buildbot/buildbot-root/abi-test/llvm/clang/unittests/Analysis/LifetimeSafetyTest.cpp:70:28: error: declaration of ‘std::unique_ptr<clang::TestAST> clang::lifetimes::internal::{anonymous}::LifetimeTestRunner::TestAST’ changes meaning of ‘TestAST’ [-fpermissive]
   70 |   std::unique_ptr<TestAST> TestAST;
      |                            ^~~~~~~
In file included from /home/buildbot/buildbot-root/abi-test/llvm/clang/unittests/Analysis/LifetimeSafetyTest.cpp:12:
/home/buildbot/buildbot-root/abi-test/llvm/clang/include/clang/Testing/TestAST.h:72:7: note: ‘TestAST’ declared here as ‘class clang::TestAST’
   72 | class TestAST {
      |       ^~~~~~~
206.923 [1367/9/5899] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CallbacksBinaryOperator.cpp.o
206.963 [1367/8/5900] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CallbacksCompoundAssignOperator.cpp.o
206.986 [1367/7/5901] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/Class.cpp.o
207.115 [1367/6/5902] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CallbacksCallExpr.cpp.o
207.198 [1367/5/5903] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/Concept.cpp.o
207.219 [1367/4/5904] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/ConstructExpr.cpp.o
207.387 [1367/3/5905] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CXXMemberCall.cpp.o
207.428 [1367/2/5906] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CXXMethodDecl.cpp.o
207.437 [1367/1/5907] Building CXX object tools/clang/unittests/CMakeFiles/AllClangUnitTests.dir/Tooling/RecursiveASTVisitorTests/CXXBoolLiteralExpr.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/149158