Some changes made, invalid on struct assignments

rtree-c/src/ReduceC.hs

rtree-c/test/cases/large/clang-22382.c

rtree-c/test/cases/small/struct.c

rtree-c/test/expected/clang-22382/extract.c

rtree-c/test/expected/clang-22382/main.c

rtree-c/test/expected/clang-22382/reduction/x0.c

rtree-c/test/expected/clang-22382/reduction/x1.c

rtree-c/test/expected/clang-22382/reduction/x2.c

rtree-c/test/expected/clang-22382/reduction/x3.c

rtree-c/test/expected/clang-22382/reduction/x4.c

rtree-c/test/expected/clang-22382/reduction/x5.c

rtree-c/test/expected/clang-22382/reduction/x6.c

rtree-c/test/expected/clang-22382/reduction/x7.c

rtree-c/test/expected/clang-22382/reduction/x8.c

rtree-c/test/expected/clang-26760/reduction/x0.c

rtree-c/test/expected/clang-26760/reduction/x1.c

rtree-c/test/expected/clang-26760/reduction/x2.c

rtree-c/test/expected/clang-26760/reduction/x3.c

rtree-c/test/expected/clang-26760/reduction/x4.c

rtree-c/test/expected/clang-26760/reduction/x5.c