Fix ASAN initialization-order-fiasco issue in tensor_layout_print.mlir test

[gflegar]

IIUC, the initialization order between static and non-static variables is not guaranteed, so we can't use the previous non-static variable to initialize a static one later on. Working around that by moving it into a static function variable.

We discovered this when upgrading to a newer LLVM version, so it might only be reproducible with new LLVM.

Here is the error:

==3551==ERROR: AddressSanitizer: initialization-order-fiasco on address 0x557bc517caa0 at pc 0x557bc3f2fbb2 bp 0x7ffda74ef270 sp 0x7ffda74ef268

READ of size 8 at 0x557bc517caa0 thread T0

    #0 0x557bc3f2fbb1 in getName llvm/include/llvm/Support/CommandLine.h:194:38

    #1 0x557bc3f2fbb1 in operator() llvm/lib/Support/CommandLine.cpp:347:5

    #2 0x557bc3f2fbb1 in __invoke<(lambda at llvm/lib/Support/CommandLine.cpp:347:5) &, llvm::cl::OptionCategory *> libcxx/include/__type_traits/invoke.h:87:27

    #3 0x557bc3f2fbb1 in __count_if<std::__u::_ClassicAlgPolicy, llvm::SmallPtrSetIterator<llvm::cl::OptionCategory *>, llvm::SmallPtrSetIterator<llvm::cl::OptionCategory *>, std::__u::__identity, (lambda at llvm/lib/Support/CommandLine.cpp:347:5)> libcxx/include/__algorithm/count_if.h:30:9

    #4 0x557bc3f2fbb1 in count_if<llvm::SmallPtrSetIterator<llvm::cl::OptionCategory *>, (lambda at llvm/lib/Support/CommandLine.cpp:347:5)> libcxx/include/__algorithm/count_if.h:41:10

    #5 0x557bc3f2fbb1 in count_if<llvm::SmallPtrSet<llvm::cl::OptionCategory *, 16U> &, (lambda at llvm/lib/Support/CommandLine.cpp:347:5)> llvm/include/llvm/ADT/STLExtras.h:1981:10

    #6 0x557bc3f2fbb1 in registerCategory llvm/lib/Support/CommandLine.cpp:347:5

    #7 0x557bc3f2fbb1 in llvm::cl::OptionCategory::registerCategory() llvm/lib/Support/CommandLine.cpp:484:17

    #8 0x557bc4504950 in OptionCategory llvm/include/llvm/Support/CommandLine.h:191:5

    #9 0x557bc4504950 in __cxx_global_var_init llvm/lib/CodeGen/GlobalISel/Combiner.cpp:37:20