[Bug tree-optimization/95565] [Feature request] add a flag to only instrument function entry.

[hiraditya at msn dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95565

--- Comment #2 from AK <hiraditya at msn dot com> ---
clang has `-finstrument-function-entry-bare` to this effect: 
https://reviews.llvm.org/D40276