[wasm] Change the constant kV8MaxWasmMemoryPages to a command line flag.

src/compiler/wasm-compiler.cc

Index: src/compiler/wasm-compiler.cc
diff --git a/src/compiler/wasm-compiler.cc b/src/compiler/wasm-compiler.cc
index a560cb1f62d9c9e2e23f1c68982603389c5309b1..8cf901567455d4b52f3e20a05704fcc4cd7cbfe0 100644
--- a/src/compiler/wasm-compiler.cc
+++ b/src/compiler/wasm-compiler.cc
@@ -1779,7 +1779,7 @@ Node* WasmGraphBuilder::GrowMemory(Node* input) {
   Diamond check_input_range(
       graph(), jsgraph()->common(),
       graph()->NewNode(jsgraph()->machine()->Uint32LessThanOrEqual(), input,
-                       jsgraph()->Uint32Constant(wasm::kV8MaxWasmMemoryPages)),
+                       jsgraph()->Uint32Constant(FLAG_wasm_max_mem_pages)),
       BranchHint::kTrue);
 
   check_input_range.Chain(*control_);