memory: Optimize gum_memory_write for Linux/Android

[DoranekoSystems]

Related to PR #988

Benchmark results

const memPtr = Memory.alloc(4096);

const module = new CModule(
  `
 #include <gum/gummemory.h>

 void zero_memory(gpointer address, gsize size) {
   guint8 zeros[4096] = {0};
   gum_memory_write(address, zeros, size);
 }
`,
  {}
);
const zero_memory = new NativeFunction(module.zero_memory, 'bool', ['pointer','int']);
let start = Date.now();
for (let i = 0; i < 1000; i++) {
  zero_memory(memPtr, 4096);
}
let end = Date.now();
console.log(`gum_memory_write => elapsedTime: ${end - start} ms`);

Device:Android Pixel3a

frida-server:16.6.5
gum_memory_write => elapsedTime: 4955 ms

this version
gum_memory_write => elapsedTime: 8 ms

[oleavr]

Thanks! 🙌

[enovella]

Sweet! <3