optimize frames; remove trampoline

internal/shop.cm

@@ -434,6 +434,16 @@ function detect_host_target() {
 
 var host_target = detect_host_target()
 
+// Must match build.cm NATIVE_CACHE_VERSION to detect stale native artifacts.
+def NATIVE_CACHE_VERSION = "native-v23"
+
+function native_sanitize_flags() {
+  if (fd.is_file('.cell/asan_aot')) {
+    return ' -fsanitize=address -fno-omit-frame-pointer'
+  }
+  return ''
+}
+
 // Check for a native .cm dylib at the deterministic lib path
 // Returns a native descriptor {_native, _handle, _sym}, or null if no native dylib exists
 // Also checks staleness: if source has changed, the content-addressed build artifact
@@ -444,6 +454,7 @@ function try_native_mod_dylib(pkg, stem) {
   var src = null
   var host = null
   var hash = null
+  var san_flags = null
   var tc_ext = null
   var build_path = null
   var handle = null
@@ -456,7 +467,8 @@ function try_native_mod_dylib(pkg, stem) {
   if (fd.is_file(src_path)) {
     src = text(fd.slurp(src_path))
     host = detect_host_target()
-    hash = content_hash(src + '\n' + host + '\nnative')
+    san_flags = native_sanitize_flags()
+    hash = content_hash(src + '\n' + host + '\nnative\n' + NATIVE_CACHE_VERSION + '\n' + san_flags)
     tc_ext = dylib_ext
     build_path = global_shop_path + '/build/' + hash + '.' + host + tc_ext
     if (!fd.is_file(build_path)) return null
@@ -1918,4 +1930,4 @@ Shop.use_native = function(path, package_context) {
   return os.native_module_load(handle, env)
 }
 
-return Shop
+return Shop