Enable call wasm-c-api native func directly from interpreter (#656)

And update loader error messages for latest spec cases, fix aot compiler build error based on latest LLVM code base.

core/iwasm/compilation/aot_llvm.c

@@ -1534,7 +1534,9 @@ aot_create_comp_context(AOTCompData *comp_data,
     LLVMAddInstructionCombiningPass(comp_ctx->pass_mgr);
     LLVMAddCFGSimplificationPass(comp_ctx->pass_mgr);
     LLVMAddJumpThreadingPass(comp_ctx->pass_mgr);
+#if LLVM_VERSION_MAJOR < 12
     LLVMAddConstantPropagationPass(comp_ctx->pass_mgr);
+#endif
     LLVMAddIndVarSimplifyPass(comp_ctx->pass_mgr);
 
     if (!option->is_jit_mode) {

core/iwasm/compilation/aot_llvm.h

@@ -7,6 +7,7 @@
 #define _AOT_LLVM_H_
 
 #include "aot.h"
+#include "llvm/Config/llvm-config.h"
 #include "llvm-c/Types.h"
 #include "llvm-c/Target.h"
 #include "llvm-c/Core.h"