Add JitObjectStackAllocation config option.

Author: erozenfeld

src/jit/jitconfigvalues.h

@@ -347,6 +347,7 @@ CONFIG_STRING(JitInlineReplayFile, W("JitInlineReplayFile"))
 #endif // defined(DEBUG) || defined(INLINE_DATA)
 
 CONFIG_INTEGER(JitInlinePolicyModel, W("JitInlinePolicyModel"), 0)
+CONFIG_INTEGER(JitObjectStackAllocation, W("JitObjectStackAllocation"), 0)
 
 CONFIG_INTEGER(JitEECallTimingInfo, W("JitEECallTimingInfo"), 0)
 

src/jit/morph.cpp

@@ -16733,6 +16733,12 @@ void Compiler::fgMorph()
     // Transform each GT_ALLOCOBJ node into either an allocation helper call or
     // local variable allocation on the stack.
     ObjectAllocator objectAllocator(this); // PHASE_ALLOCATE_OBJECTS
+
+    if (JitConfig.JitObjectStackAllocation() && !opts.MinOpts() && !opts.compDbgCode)
+    {
+        objectAllocator.EnableObjectStackAllocation();
+    }
+
     objectAllocator.Run();
 
     /* Add any internal blocks/trees we may need */