Strip .llvm. suffix after removing the coroutine suffixes to avoid breaking pseudo probe (#191354)

Pseudo probe is currently broken when a coroutine function is promoted
with a global name during ThinLTO import. The top-level function GUID in
.pseudo_probe section are computed from the promoted name (with
".llvm.xxxx" suffix) instead of the original function name. Then it will
cause a dangling top-level GUID that doesn't have any reference in the
pseudo probe desc, and potentially hurt profile quality.

The root cause of the issue were:
1) ThinLTO post-link imports and promotes a local coroutine function,
creating a global function with ".llvm.xxxx" suffix.
2) https://github.com/llvm/llvm-project/pull/141889 introduces a change
in CoroSplit pass that updates the coroutine functions linkage name with
the ".cleanup", ".destroy", ".resume" suffixes, and this creates
top-level functions with ".llvm.xxxx.cleanup", ".llvm.xxxx.destroy",
".llvm.xxxx.resume" suffixes.
3) PseudoProbePrinter and PseudoProbeInserter only strips coroutine
suffix, and didn't consider the ".llvm." suffix.

This patch fixes the issue in step 3)