Disabled stackoverflow tests with largeframe for RISCV64 (#106383)

For bigger structures than the page size, the current way of calculating
whether failureAddress is a part of the stack is not always proper.
Because siginfo_t structure with failureAddress (si_addr field) comes from OS
the problem must be related with SP or with the formula:
  (failureAddress - (sp - GetVirtualPageSize())) < 2 * GetVirtualPageSize()
which is used to check if SIGSEGV is a stack overflow.

src/tests/baseservices/exceptions/stackoverflow/stackoverflowtester.cs

@@ -115,9 +115,10 @@ public static void TestStackOverflowSmallFrameMainThread()
         [Fact]
         public static void TestStackOverflowLargeFrameMainThread()
         {
-            if ((RuntimeInformation.ProcessArchitecture == Architecture.Arm64) &&
+            if (((RuntimeInformation.ProcessArchitecture == Architecture.Arm64) || (RuntimeInformation.ProcessArchitecture == Architecture.RiscV64)) &&
                 ((Environment.OSVersion.Platform == PlatformID.Unix) || (Environment.OSVersion.Platform == PlatformID.MacOSX)))
             {
+                // Disabled on Unix RISCV64, similar to ARM64.
                 // Disabled on Unix ARM64 due to https://github.com/dotnet/runtime/issues/13519
                 // The current stack probing doesn't move the stack pointer and so the runtime sometimes cannot
                 // recognize the underlying sigsegv as stack overflow when it probes too far from SP.
@@ -181,9 +182,10 @@ public static void TestStackOverflowSmallFrameSecondaryThread()
         [Fact]
         public static void TestStackOverflowLargeFrameSecondaryThread()
         {
-            if ((RuntimeInformation.ProcessArchitecture == Architecture.Arm64) &&
+            if (((RuntimeInformation.ProcessArchitecture == Architecture.Arm64) || (RuntimeInformation.ProcessArchitecture == Architecture.RiscV64)) &&
                 ((Environment.OSVersion.Platform == PlatformID.Unix) || (Environment.OSVersion.Platform == PlatformID.MacOSX)))
             {
+                // Disabled on Unix RISCV64, similar to ARM64.
                 // Disabled on Unix ARM64 due to https://github.com/dotnet/runtime/issues/13519
                 // The current stack probing doesn't move the stack pointer and so the runtime sometimes cannot
                 // recognize the underlying sigsegv as stack overflow when it probes too far from SP.