wamrc: add --disable-llvm-jump-tables option (#4224)

while ideally a user should not need to care this kind of
optimization details, in reality i guess it's sometimes useful.
both of clang and GCC expose a similar option.  (-fno-jump-tables)

core/iwasm/compilation/aot_llvm.h

@@ -448,6 +448,9 @@ typedef struct AOTCompContext {
     /* Disable LLVM built-in intrinsics */
     bool disable_llvm_intrinsics;
 
+    /* Disable LLVM jump tables */
+    bool disable_llvm_jump_tables;
+
     /* Disable LLVM link time optimization */
     bool disable_llvm_lto;