[mono][interp] Return null for localloc with len 0 (#73174)

so that accessing the result address throws exception.

Fixes https://github.com/dotnet/runtime/issues/54359

src/mono/mono/mini/interp/interp.c

@@ -7127,10 +7127,15 @@ MINT_IN_CASE(MINT_BRTRUE_I8_SP) ZEROP_SP(gint64, !=); MINT_IN_BREAK;
 
 		MINT_IN_CASE(MINT_LOCALLOC) {
 			int len = LOCAL_VAR (ip [2], gint32);
-			gpointer mem = frame_data_allocator_alloc (&context->data_stack, frame, ALIGN_TO (len, MINT_VT_ALIGNMENT));
+			gpointer mem;
+			if (len > 0) {
+				mem = frame_data_allocator_alloc (&context->data_stack, frame, ALIGN_TO (len, MINT_VT_ALIGNMENT));
 
-			if (frame->imethod->init_locals)
-				memset (mem, 0, len);
+				if (frame->imethod->init_locals)
+					memset (mem, 0, len);
+			} else {
+				mem = NULL;
+			}
 			LOCAL_VAR (ip [1], gpointer) = mem;
 			ip += 3;
 			MINT_IN_BREAK;

src/tests/issues.targets

@@ -2504,9 +2504,6 @@
         <ExcludeList Include = "$(XunitTestBinBase)/JIT/Regression/JitBlue/DevDiv_544983/DevDiv_544983/**">
             <Issue>https://github.com/dotnet/runtime/issues/54393</Issue>
         </ExcludeList>
-        <ExcludeList Include = "$(XunitTestBinBase)/JIT/CodeGenBringUpTests/Localloc_do/**">
-            <Issue>https://github.com/dotnet/runtime/issues/54359</Issue>
-        </ExcludeList>
         <ExcludeList Include = "$(XunitTestBinBase)/JIT/Directed/Misc/function_pointer/MutualThdRecur-fptr/**">
             <Issue>needs triage</Issue>
         </ExcludeList>
@@ -2624,9 +2621,6 @@
         <ExcludeList Include = "$(XunitTestBinBase)/JIT/Methodical/eh/interactions/strswitchfinal_d/**">
             <Issue>needs triage</Issue>
         </ExcludeList>
-        <ExcludeList Include = "$(XunitTestBinBase)/JIT/CodeGenBringUpTests/Localloc_do/**">
-            <Issue>https://github.com/dotnet/runtime/issues/54359</Issue>
-        </ExcludeList>
         <ExcludeList Include = "$(XunitTestBinBase)/JIT/Directed/Misc/function_pointer/MutualThdRecur-fptr/**">
             <Issue>needs triage</Issue>
         </ExcludeList>
@@ -2642,15 +2636,6 @@
         <ExcludeList Include = "$(XunitTestBinBase)/Loader/classloader/DefaultInterfaceMethods/diamondshape/diamondshape_r/**">
             <Issue>https://github.com/dotnet/runtime/issues/54399</Issue>
         </ExcludeList>
-        <ExcludeList Include = "$(XunitTestBinBase)/JIT/CodeGenBringUpTests/Localloc_r/**">
-            <Issue>https://github.com/dotnet/runtime/issues/54359</Issue>
-        </ExcludeList>
-        <ExcludeList Include = "$(XunitTestBinBase)/JIT/CodeGenBringUpTests/Localloc_ro/**">
-            <Issue>https://github.com/dotnet/runtime/issues/54359</Issue>
-        </ExcludeList>
-        <ExcludeList Include = "$(XunitTestBinBase)/JIT/CodeGenBringUpTests/Localloc_d/**">
-            <Issue>https://github.com/dotnet/runtime/issues/54359</Issue>
-        </ExcludeList>
         <ExcludeList Include = "$(XunitTestBinBase)/JIT/Regression/CLR-x86-JIT/V1-M09.5-PDC/b25459/b25459/**">
             <Issue>https://github.com/dotnet/runtime/issues/54393</Issue>
         </ExcludeList>