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

[via llvm-commits]

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@@ -127,11 +127,26 @@ void MemMapLinux::releaseAndZeroPagesToOSImpl(uptr From, uptr Size) {
 }
 
 bool ReservedMemoryLinux::createImpl(uptr Addr, uptr Size, const char *Name,
-                                     uptr Flags) {
+                                     uptr Flags, uptr Alignment) {
   ReservedMemoryLinux::MemMapT MemMap;
-  if (!MemMap.map(Addr, Size, Name, Flags | MAP_NOACCESS))
+  uptr MapSize = Size;
+  if (Alignment != getPageSizeCached())
+    MapSize += Alignment;
+  if (!MemMap.map(Addr, MapSize, Name, Flags | MAP_NOACCESS))
     return false;
 
+  if (Alignment != getPageSizeCached()) {
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ChiaHungDuan wrote:

Add `LIKELY`, let me know if you think a comment is better.

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