supp. coro releated asan errors

Signed-off-by: Pratik Mankawde <3397372+pratikmankawde@users.noreply.github.com>

cspell.config.yaml

@@ -101,6 +101,7 @@ words:
   - fcontext
   - finalizers
   - firewalled
+  - flackiness
   - fmtdur
   - fsanitize
   - funclets

sanitizers/suppressions/asan.supp

@@ -9,17 +9,9 @@
 # - stack-buffer-overflow errors in seemingly unrelated code (e.g., std::chrono::steady_clock::now())
 # - stack-buffer-underflow errors in seemingly unrelated code (e.g., xxhasher::retrieveHash(), clock_gettime)
 #
-# These are suppressed via:
-# 1. Runtime option: detect_stack_use_after_return=0 (in ASAN_OPTIONS in CI workflow)
-# 2. Compile-time flag: -fno-sanitize-address-use-after-scope (in cmake/XrplSanitizers.cmake)
-#
-# Note: stack-buffer-overflow false positives from coroutines cannot be fully suppressed
-# without disabling ASAN entirely for Boost. Clang builds use -fsanitize-blacklist to
-# exclude Boost headers, but GCC does not support this feature.
-#
-# See: https://github.com/google/sanitizers/issues/189
+# These are now handled by using coroutine2 and ucontext backend.
 
-# Boost - false positives from stackful coroutines
 interceptor_name:clock_gettime
 interceptor_name:__bzero
 interceptor_name:nudb
+interceptor_name:coro # Suppress any flackiness