[interop][SwiftToCxx] use 'nodebug' instead of articial for interop thunks

a combination of always_inline and nodebug allows LLDB to skip over thunks

Author: hyp

lib/PrintAsClang/_SwiftCxxInteroperability.h

@@ -31,16 +31,16 @@
 /// The `SWIFT_INLINE_THUNK` macro is applied on the inline function thunks in
 /// the header that represents a C/C++ Swift module interface generated by the
 /// Swift compiler.
-#if __has_attribute(always_inline) && __has_attribute(artificial)
+#if __has_attribute(always_inline) && __has_attribute(nodebug)
 #if defined(DEBUG) && __has_attribute(used)
 // Additional 'used' attribute is used in debug mode to make inline thunks
 // accessible to LLDB.
 #define SWIFT_INLINE_THUNK_ATTRIBUTES                                          \
-  __attribute__((always_inline)) __attribute__((artificial))                   \
+  __attribute__((always_inline)) __attribute__((nodebug))                   \
   __attribute__((used))
 #else
 #define SWIFT_INLINE_THUNK_ATTRIBUTES                                          \
-  __attribute__((always_inline)) __attribute__((artificial))
+  __attribute__((always_inline)) __attribute__((nodebug))
 #endif
 #else
 #define SWIFT_INLINE_THUNK_ATTRIBUTES