revert 19bed6c (#6469)

Author: iddqdex

ydb/core/protos/feature_flags.proto

@@ -99,10 +99,10 @@ message TFeatureFlags {
     optional bool EnableSmallDiskOptimization = 84 [default = true];
     optional bool EnableDataShardVolatileTransactions = 85 [default = false];
     optional bool EnableTopicServiceTx = 86 [default = false];
-    optional bool EnableLLVMCache = 87 [default = true];
+    optional bool EnableLLVMCache = 87 [default = false];
     optional bool EnableExternalDataSources = 88 [default = false];
     optional bool EnableTopicDiskSubDomainQuota = 89 [default = true];
-    optional bool EnableSeparationComputeActorsFromRead = 90 [default = true];
+    optional bool EnableSeparationComputeActorsFromRead = 90 [default = false];
     optional bool EnablePQConfigTransactionsAtSchemeShard = 91 [default = false];
     optional bool EnableScriptExecutionOperations = 92 [default = true];
     optional bool EnableImplicitQueryParameterTypes = 93 [default = false];