Disable BG Parse and Parse State caching by default

Both features need a little more bake time. They can be turned on with a flag.

Author: digitalinfinity

lib/Common/ConfigFlagsList.h

@@ -434,14 +434,15 @@ PHASE(All)
 #define DEFAULT_CONFIG_WasmSignExtends      (true)
 #define DEFAULT_CONFIG_WasmNontrapping      (true)
 #define DEFAULT_CONFIG_WasmExperimental     (false)
+#define DEFAULT_CONFIG_BgParse              (false)
 #define DEFAULT_CONFIG_BgJitDelayFgBuffer   (0)
 #define DEFAULT_CONFIG_BgJitPendingFuncCap  (31)
 #define DEFAULT_CONFIG_CurrentSourceInfo    (true)
 #define DEFAULT_CONFIG_CreateFunctionProxy  (true)
 #define DEFAULT_CONFIG_HybridFgJit          (false)
 #define DEFAULT_CONFIG_HybridFgJitBgQueueLengthThreshold (32)
 #define DEFAULT_CONFIG_Prejit               (false)
-#define DEFAULT_CONFIG_ParserStateCache     (true)
+#define DEFAULT_CONFIG_ParserStateCache     (false)
 #define DEFAULT_CONFIG_DeferTopLevelTillFirstCall (true)
 #define DEFAULT_CONFIG_DirectCallTelemetryStats (false)
 #define DEFAULT_CONFIG_errorStackTrace      (true)
@@ -971,7 +972,7 @@ FLAGR (NumberSet, BailOutByteCode     , "Byte code location to insert BailOut. U
 #endif
 FLAGNR(Boolean, Benchmark             , "Disable security code which introduce variability in benchmarks", false)
 FLAGR (Boolean, BgJit                 , "Background JIT. Disable to force heuristic-based foreground JITting. (default: true)", true)
-FLAGR (Boolean, BgParse               , "Background Parse. Disable to force all parsing to occur on UI thread. (default: true)", true)
+FLAGR (Boolean, BgParse               , "Background Parse. Disable to force all parsing to occur on UI thread. (default: true)", DEFAULT_CONFIG_BgParse)
 FLAGNR(Number,  BgJitDelay            , "Delay to wait for speculative jitting before starting script execution", DEFAULT_CONFIG_BgJitDelay)
 FLAGNR(Number,  BgJitDelayFgBuffer    , "When speculatively jitting in the foreground thread, do so for (BgJitDelay - BgJitDelayBuffer) milliseconds", DEFAULT_CONFIG_BgJitDelayFgBuffer)
 FLAGNR(Number,  BgJitPendingFuncCap   , "Disable delay if pending function count larger then cap", DEFAULT_CONFIG_BgJitPendingFuncCap)