mimalloc: avoid having to link to psapi just for mimalloc

Instead, load the `GetProcessMemoryInfo()` function dynamically. When
needed. If needed.

This is necessary because the start-up cost of Git processes spent on
loading dynamic libraries is non-negligible.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

compat/mimalloc/stats.c

@@ -459,6 +459,7 @@ mi_msecs_t _mi_clock_end(mi_msecs_t start) {
 #include <windows.h>
 #include <psapi.h>
 #pragma comment(lib,"psapi.lib")
+#include "compat/win32/lazyload.h"
 
 static mi_msecs_t filetime_msecs(const FILETIME* ftime) {
   ULARGE_INTEGER i;
@@ -479,12 +480,17 @@ static void mi_stat_process_info(mi_msecs_t* elapsed, mi_msecs_t* utime, mi_msec
   *utime = filetime_msecs(&ut);
   *stime = filetime_msecs(&st);
   PROCESS_MEMORY_COUNTERS info;
-  GetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info));
-  *current_rss    = (size_t)info.WorkingSetSize;
-  *peak_rss       = (size_t)info.PeakWorkingSetSize;
-  *current_commit = (size_t)info.PagefileUsage;
-  *peak_commit    = (size_t)info.PeakPagefileUsage;
-  *page_faults    = (size_t)info.PageFaultCount;
+  DECLARE_PROC_ADDR(psapi, BOOL, WINAPI, GetProcessMemoryInfo, HANDLE, PPROCESS_MEMORY_COUNTERS, DWORD);
+  if (INIT_PROC_ADDR(GetProcessMemoryInfo)) {
+    GetProcessMemoryInfo(GetCurrentProcess(), &info, sizeof(info));
+    *current_rss    = (size_t)info.WorkingSetSize;
+    *peak_rss       = (size_t)info.PeakWorkingSetSize;
+    *current_commit = (size_t)info.PagefileUsage;
+    *peak_commit    = (size_t)info.PeakPagefileUsage;
+    *page_faults    = (size_t)info.PageFaultCount;
+  } else {
+    *current_rss = *peak_rss = *current_commit = *peak_commit = *page_faults = 0;
+  }
 }
 
 #elif !defined(__wasi__) && (defined(__unix__) || defined(__unix) || defined(unix) || defined(__APPLE__) || defined(__HAIKU__))