[UCRT] Import Microsoft.Windows.SDK.CRTSource version 10.0.22621.3

Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3
License: MIT

sdk/lib/ucrt/heap/realloc.cpp

@@ -0,0 +1,41 @@
+//
+// realloc.cpp
+//
+//      Copyright (c) Microsoft Corporation. All rights reserved.
+//
+// Implementation of realloc().
+//
+#include <corecrt_internal.h>
+#include <malloc.h>
+
+// Reallocates a block of memory in the heap.
+//
+// This function reallocates the block pointed to by 'block' such that it is
+// 'size' bytes in size.  The new size may be either greater or less than the
+// original size of the block.  The reallocation may result in the block being
+// moved to a new location in memory.  If the block is moved, the contents of
+// the original block are copied.
+//
+// Standard behavior notes:
+// [1] realloc(nullptr, new_size) is equivalent to malloc(new_size)
+// [2] realloc(p, 0) is equivalent to free(p), and nullptr is returned
+// [3] If reallocation fails, the original block is left unchanged
+//
+// If 'block' is non-null, it must point to a valid block of memory allocated in
+// the heap.
+//
+// This function supports patching and therefore must be marked noinline.
+// Both _realloc_dbg and _realloc_base must also be marked noinline
+// to prevent identical COMDAT folding from substituting calls to realloc
+// with either other function or vice versa.
+extern "C" _CRT_HYBRIDPATCHABLE __declspec(noinline) _CRTRESTRICT void* __cdecl realloc(
+    void*  const block,
+    size_t const size
+    )
+{
+    #ifdef _DEBUG
+    return _realloc_dbg(block, size, _NORMAL_BLOCK, nullptr, 0);
+    #else
+    return _realloc_base(block, size);
+    #endif
+}