Revert "Implement call Fast JIT function from LLVM JIT jitted code" (#1737)

Reverts bytecodealliance/wasm-micro-runtime#1714, which was merged mistakenly.

core/iwasm/fast-jit/jit_frontend.h

@@ -13,10 +13,6 @@
 #include "../aot/aot_runtime.h"
 #endif
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #if WASM_ENABLE_AOT == 0
 typedef enum IntCond {
     INT_EQZ = 0,
@@ -147,9 +143,6 @@ jit_frontend_translate_func(JitCompContext *cc);
 bool
 jit_frontend_lower(JitCompContext *cc);
 
-uint32
-jit_frontend_get_jitted_return_addr_offset();
-
 uint32
 jit_frontend_get_global_data_offset(const WASMModule *module,
                                     uint32 global_idx);
@@ -490,8 +483,4 @@ set_local_f64(JitFrame *frame, int n, JitReg val)
 #define PUSH_FUNCREF(v) PUSH(v, VALUE_TYPE_FUNCREF)
 #define PUSH_EXTERNREF(v) PUSH(v, VALUE_TYPE_EXTERNREF)
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif