This change migrates most llvm-symbolizer tests away from reading input via stdin and instead using --obj + positional arguments for the file and addresses respectively, which makes the test easier to read.
One exception is the test test/tools/llvm-symbolizer/pdb/pdb.test, which was doing some manipulation on the input addresses. I've simplified this somewhat, but it still reads from stdin.
More changes to follow to simplify/break-up other tests.