LLVM 17/18 proftext parsing failure

[xd009642]

I don't care a great deal about these because they're not something tarpaulin requires, but it would be generally nice to fix them. For llvm 17 and 18 I've removed the following test vector from proftext parsing:

flatten_instr.proftext:

# IR level Instrumentation Flag
:ir
# Always instrument the function entry block
:entry_first
foo
# Func Hash:
1111
# Num Counters:
5
# Counter Values:
10000
50
2000
40
6000

bar.cc:bar
# Func Hash:
2222
# Num Counters:
10
# Counter Values:
0
0
0
0
0
0
0
0
0
0

[jyn514]

there's now a list of all known failing .proftext files at

llvm-profparser/tests/profdata.rs

Line 207 in ee7c769

static KNOWN_FAILING_TESTS: &[(Option<u8>, &str)] = &[