[compiler-rt] [scudo] limit VMA size for riscv64 for DefaultConfig (PR #76013)

[Icenowy Zheng via llvm-commits]

================
@@ -124,8 +124,14 @@ struct DefaultConfig {
   struct Primary {
     using SizeClassMap = DefaultSizeClassMap;
 #if SCUDO_CAN_USE_PRIMARY64
+#if SCUDO_RISCV64
+    // Support 39-bit VMA for riscv-64
+    static const uptr RegionSizeLog = 30U;
+    static const uptr GroupSizeLog = 19U;
+#else
----------------
Icenowy wrote:

well thus why is a smaller number suggested? shouldn't it be as big as the program do not crash?

https://github.com/llvm/llvm-project/pull/76013