[common/virtual_buffer] Fix Windows on Snapdragon 7C realizing virtual pages before they're needed (#4128)

This should fix Windows devices with low RAM like 4GB, or anything lower than 8GB.

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4128
Reviewed-by: Maufeat <sahyno1996@gmail.com>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/common/virtual_buffer.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
@@ -17,7 +17,11 @@ namespace Common {
 
 void* AllocateMemoryPages(std::size_t size) noexcept {
 #ifdef _WIN32
-    void* base = VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_READWRITE);
+    void* base = VirtualAlloc(nullptr, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
+    if (base == nullptr) {
+        // Probably failing to reserve is less likely than failing to commit
+        base = VirtualAlloc(nullptr, size, MEM_COMMIT, PAGE_READWRITE);
+    }
 #else
     void* base = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
     if (base == MAP_FAILED)