Reduce ASAN native stack check gap

Summary:
Original Author: avp@meta.com
Original Git: be237c7
Original Reviewed By: tmikov
Original Revision: D67346000

This was causing RangeErrors to be reported too early in ASAN,
and reducing it by half doesn't appear to cause crashes in any tests.

Reviewed By: tmikov

Differential Revision: D67410290

fbshipit-source-id: 27c8f2f8e4e1181385874eb3c0a99790586f6d82

include/hermes/VM/Runtime.h

@@ -1626,7 +1626,7 @@ class ScopedNativeDepthReducer {
   // This is empirically good enough.
   static constexpr int kReducedNativeStackGap =
 #if LLVM_ADDRESS_SANITIZER_BUILD
-      256 * 1024;
+      128 * 1024;
 #else
       32 * 1024;
 #endif

lib/VM/Runtime.cpp

@@ -87,7 +87,7 @@ static constexpr uint32_t kMaxSupportedNumRegisters =
 /// The minimum stack gap allowed from RuntimeConfig.
 static constexpr uint32_t kMinSupportedNativeStackGap =
 #if LLVM_ADDRESS_SANITIZER_BUILD
-    512 * 1024;
+    256 * 1024;
 #else
     64 * 1024;
 #endif