[compiler-rt] [scudo] Don't preserve space for regions at init() (DO NOT MERGE) (PR #74531)

[Fabio D'Urso via llvm-commits]

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@@ -129,7 +129,7 @@ void MemMapLinux::releaseAndZeroPagesToOSImpl(uptr From, uptr Size) {
 bool ReservedMemoryLinux::createImpl(uptr Addr, uptr Size, const char *Name,
                                      uptr Flags) {
   ReservedMemoryLinux::MemMapT MemMap;
-  if (!MemMap.map(Addr, Size, Name, Flags | MAP_NOACCESS))
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fabio-d wrote:

I think the choice of whether to pass `MAP_ALLOWNOMEM` or not can be left to the caller, like we do in `ReservedMemoryFuchsia::createImpl`

https://github.com/llvm/llvm-project/pull/74531