[compiler-rt] [scudo] Add EnableMultiRegions mode (PR #98076)

[Christopher Ferris via llvm-commits]

================
@@ -127,10 +127,29 @@ void MemMapLinux::releaseAndZeroPagesToOSImpl(uptr From, uptr Size) {
 }
 
 bool ReservedMemoryLinux::createImpl(uptr Addr, uptr Size, const char *Name,
-                                     uptr Flags) {
+                                     uptr Flags, uptr AlignmentPages) {
   ReservedMemoryLinux::MemMapT MemMap;
-  if (!MemMap.map(Addr, Size, Name, Flags | MAP_NOACCESS))
-    return false;
+  const bool NeedToAdjustAlignment = AlignmentPages != 1;
+  uptr MapSize = Size;
+
+  if (LIKELY(!NeedToAdjustAlignment)) {
+    if (!MemMap.map(Addr, MapSize, Name, Flags | MAP_NOACCESS))
----------------
cferris1000 wrote:

Should this have MAP_ALLOWNOMEM in the flags? Same with theMap calls below.

https://github.com/llvm/llvm-project/pull/98076