NFC: clang-format test_demangle.pass.cpp but keep test "lines"

Add clang-format on/off around test "lines"

Run clang-format without breaking string literals:
clang-format --style='{BasedOnStyle: llvm, BreakStringLiterals: false}'
-i test_demangle.pass.cpp

Add clang-format on/off on fp_literal_cases

Fixups: Split UNSUPPORTED to next line; xfail_cases trailing comma

Replace physical tab

GitOrigin-RevId: d33bf2e9df578ff7e44fd22504d6ad5a122b7ee6
1 file changed