Add spall profiler and stop generating layout every frame

src/basic/win32.cpp

@@ -204,3 +204,25 @@ FileIter IterateFiles(Allocator alo, String path) {
     Advance(&it);
     return it;
 }
+
+#if _WIN32
+    #include <Windows.h>
+double get_time_in_micros(void) {
+    static double invfreq;
+    if (!invfreq) {
+        LARGE_INTEGER frequency;
+        QueryPerformanceFrequency(&frequency);
+        invfreq = 1000000.0 / frequency.QuadPart;
+    }
+    LARGE_INTEGER counter;
+    QueryPerformanceCounter(&counter);
+    return counter.QuadPart * invfreq;
+}
+#else
+    #include <unistd.h>
+double get_time_in_micros(void) {
+    struct timespec spec;
+    clock_gettime(CLOCK_MONOTONIC, &spec);
+    return (((double)spec.tv_sec) * 1000000) + (((double)spec.tv_nsec) / 1000);
+}
+#endif