Introduce switch for stress-morphing

Author: SingleAccretion

src/coreclr/jit/flowgraph.cpp

@@ -2901,6 +2901,19 @@ PhaseStatus Compiler::fgRationalizeAssignments()
 
     compAssignmentRationalized = true;
 
+#ifdef DEBUG
+    if (JitConfig.JitStressMorphStores())
+    {
+        for (BasicBlock* block : Blocks())
+        {
+            for (Statement* stmt : block->Statements())
+            {
+                fgMorphBlockStmt(block, stmt DEBUGARG("fgRationalizeAssignments"));
+            }
+        }
+    }
+#endif // DEBUG
+
     return PhaseStatus::MODIFIED_EVERYTHING;
 }
 

src/coreclr/jit/jitconfigvalues.h

@@ -170,6 +170,7 @@ CONFIG_INTEGER(JitStressModeNamesOnly, W("JitStressModeNamesOnly"), 0) // Intern
 CONFIG_INTEGER(JitStressProcedureSplitting, W("JitStressProcedureSplitting"), 0) // Always split after the first basic
                                                                                  // block. Skips functions with EH
                                                                                  // for simplicity.
+CONFIG_INTEGER(JitStressMorphStores, W("JitStressMorphStores"), 0) // Morph trees after assignment rationalization
 CONFIG_INTEGER(JitStressRegs, W("JitStressRegs"), 0)
 CONFIG_STRING(JitStressRegsRange, W("JitStressRegsRange")) // Only apply JitStressRegs to methods in this hash range