Without alias analysis Flang assumes no aliasing in lowering record
assignments which can result in miscompilation of programs using
`SEQUENCE` types and `EQUIVALENCE`.
Use alias analysis to guard the fast path in `genRecordAssignment`;
otherwise fall back to element-wise expansion.
Update FIR FileCheck expectations
Add `FIRAnalysis` to "flang/unittests/Optimizer/CMakeLists.txt" to fix
the Windows x64 build failure (linker error).
Add `SEQUENCE` handling and update tests accordingly.
Fixes#175246 (and includes the fix to
"flang/lib/Optimizer/Builder/CMakeLists.txt" in PR #176483).
Co-authored-by: Matt P. Dziubinski <matt-p.dziubinski@hpe.com>
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