Add regression concurrent os executions flag to avoid running debug plugin tests

src/test/cpp/regression/main.cpp

@@ -3847,9 +3847,11 @@ int main(int argc, char **argv, char **env) {
             #endif
 
 			#ifdef DEBUG_PLUGIN
+			#ifndef CONCURRENT_OS_EXECUTIONS
 				redo(REDO,DebugPluginTest().run(1e6););
             #endif
 			#endif
+		#endif
 
 		#ifdef CUSTOM_SIMD_ADD
 			redo(REDO,WorkspaceRegression("custom_simd_add").loadHex("../custom/simd_add/build/custom_simd_add.hex")->bootAt(0x00000000u)->run(50e3););

src/test/cpp/regression/makefile

@@ -51,7 +51,9 @@ else
 	ADDCFLAGS += -CFLAGS -O3  -O3
 endif
 
-
+ifeq ($(CONCURRENT_OS_EXECUTIONS),yes)
+	ADDCFLAGS += -CCONCURRENT_OS_EXECUTIONS
+endif
 
 ifeq ($(LITEX),yes)
 	ADDCFLAGS += -CFLAGS -DLITEX