7dc0ba949c
The legacy pass manager printed the function name when printing
loop info (via -analyze option). Like this:
Printing analysis 'Natural Loop Information' for function 'func':
Loop at depth 1 containing: ...
Loop at depth 2 containing: ...
Make sure we print such a first line including the function name
also when using the new pass manager version of LoopPrinterPass.
The format of the string is changed slightly, so now we say:
Loop info for function 'func':
Loop at depth 1 containing: ...
Loop at depth 2 containing: ...
This was originally requested in
https://discourse.llvm.org/t/need-usage-help-w-new-pass-manager-for-opt-analysis-natural-loop-information/75874/7
and also mentioned in
https://github.com/llvm/llvm-project/issues/76762