[wasm] Trap handling: ProtectedLoad instruction

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 83d32dccbfc09f48d365d94af11b5ae22bf3aec0..e1895e3ef47761673df423b4d1c86a16a0e41d00 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -531,6 +531,10 @@ DEFINE_BOOL(wasm_simd_prototype, false,
 DEFINE_BOOL(wasm_eh_prototype, false,
             "enable prototype exception handling opcodes for wasm")
 
+DEFINE_BOOL(wasm_trap_handler, false,
+            "use signal handlers to catch out of bounds memory access in wasm"
+            " (currently Linux x86_64 only)")
+
 // Profiler flags.
 DEFINE_INT(frame_count, 1, "number of stack frames inspected by the profiler")
 // 0x1800 fits in the immediate field of an ARM instruction.