Changed posix impl of _aligned_malloc to match MemAlloc_Aligned behavior (other than tracking).

public/tier1/utlmemory.h

@@ -38,11 +38,22 @@
 #endif
 
 #if defined(_LINUX) || defined(__APPLE__)
-inline void *_aligned_malloc( size_t size, size_t alignment )
+inline void *_aligned_malloc( size_t size, size_t align )
 {
-	void *pTemp;
-	posix_memalign( &pTemp, alignment, size );
-	return pTemp;
+	unsigned char *pAlloc, *pResult;
+
+	if (!IsPowerOfTwo(uint(align)))
+		return NULL;
+
+	align = (align > sizeof(void *) ? align : sizeof(void *)) - 1;
+
+	if ( (pAlloc = (unsigned char*)malloc( sizeof(void *) + align + size ) ) == (unsigned char*)NULL)
+		return NULL;
+
+	pResult = (unsigned char*)( (size_t)(pAlloc + sizeof(void *) + align ) & ~align );
+	((unsigned char**)(pResult))[-1] = pAlloc;
+
+	return (void *)pResult;
 }
 #endif