deps: Modified chakracore to enable/disable SIMD

Currently chakracore has `SIMD` under experimental flag which is
ON by default. However recently v8 added this feature under
experimental mode. This fails basic scenario of `util-inspect`.
Temporarily addressed this by exposing a flag in `chakracore`
that will control if `SIMD` will be present on global object or not.
Long time solution would be to expose config flags to JSRT layer
so that ES6 experimental features can be turned ON/OFF on demand.

Opened chakra-core/ChakraCore#1064 to track this
in chakracore.

PR-URL: #76
Reviewed-By: Jianchun Xu <Jianchun.Xu@microsoft.com>

Author: kunalspathak

deps/chakrashim/core/lib/Runtime/Base/ThreadContext.cpp

@@ -99,7 +99,7 @@ ThreadContext::RecyclableData::RecyclableData(Recycler *const recycler) :
 #define ALLOC_XDATA (false)
 #endif
 
-ThreadContext::ThreadContext(AllocationPolicyManager * allocationPolicyManager, JsUtil::ThreadService::ThreadServiceCallback threadServiceCallback, bool enableExperimentalFeatures) :
+ThreadContext::ThreadContext(AllocationPolicyManager * allocationPolicyManager, JsUtil::ThreadService::ThreadServiceCallback threadServiceCallback, bool enableExperimentalFeatures, bool enableSimdjsFeature) :
     currentThreadId(::GetCurrentThreadId()),
     stackLimitForCurrentThread(0),
     stackProber(nullptr),
@@ -176,7 +176,7 @@ ThreadContext::ThreadContext(AllocationPolicyManager * allocationPolicyManager,
     dynamicObjectEnumeratorCacheMap(&HeapAllocator::Instance, 16),
     //threadContextFlags(ThreadContextFlagNoFlag),
     telemetryBlock(&localTelemetryBlock),
-    configuration(enableExperimentalFeatures),
+    configuration(enableExperimentalFeatures, enableSimdjsFeature),
     jsrtRuntime(nullptr),
     rootPendingClose(nullptr),
     wellKnownHostTypeHTMLAllCollectionTypeId(Js::TypeIds_Undefined),

deps/chakrashim/core/lib/Runtime/Base/ThreadContext.h

@@ -309,12 +309,13 @@ class JITTimer
 class ThreadConfiguration
 {
 public:
-    ThreadConfiguration(bool enableExperimentalFeatures)
+    ThreadConfiguration(bool enableExperimentalFeatures, bool enableSimdjsFeature)
     {
         CopyGlobalFlags();
         if (enableExperimentalFeatures)
         {
             EnableExperimentalFeatures();
+            m_Simdjs = enableSimdjsFeature;
         }
     }
 
@@ -1004,7 +1005,7 @@ class ThreadContext sealed :
     ArenaAllocator* GetThreadAlloc() { return &threadAlloc; }
     static CriticalSection * GetCriticalSection() { return &s_csThreadContext; }
 
-    ThreadContext(AllocationPolicyManager * allocationPolicyManager = nullptr, JsUtil::ThreadService::ThreadServiceCallback threadServiceCallback = nullptr, bool enableExperimentalFeatures = false);
+    ThreadContext(AllocationPolicyManager * allocationPolicyManager = nullptr, JsUtil::ThreadService::ThreadServiceCallback threadServiceCallback = nullptr, bool enableExperimentalFeatures = false, bool enableSimdjsFeature = false);
     static void Add(ThreadContext *threadContext);
 
     ThreadConfiguration const * GetConfig() const { return &configuration; }

deps/chakrashim/core/lib/jsrt/Jsrt.cpp

@@ -83,7 +83,8 @@ STDAPI_(JsErrorCode) JsCreateRuntime(_In_ JsRuntimeAttributes attributes, _In_op
             JsRuntimeAttributeDisableEval |
             JsRuntimeAttributeDisableNativeCodeGeneration |
             JsRuntimeAttributeEnableExperimentalFeatures |
-            JsRuntimeAttributeDispatchSetExceptionsToDebugger
+            JsRuntimeAttributeDispatchSetExceptionsToDebugger |
+            JsRuntimeAttributeEnableSimdjsFeature
 #ifdef ENABLE_DEBUG_CONFIG_OPTIONS
             | JsRuntimeAttributeSerializeLibraryByteCode
 #endif
@@ -97,7 +98,8 @@ STDAPI_(JsErrorCode) JsCreateRuntime(_In_ JsRuntimeAttributes attributes, _In_op
 
         AllocationPolicyManager * policyManager = HeapNew(AllocationPolicyManager, (attributes & JsRuntimeAttributeDisableBackgroundWork) == 0);
         bool enableExperimentalFeatures = (attributes & JsRuntimeAttributeEnableExperimentalFeatures) != 0;
-        ThreadContext * threadContext = HeapNew(ThreadContext, policyManager, threadService, enableExperimentalFeatures);
+        bool enableSimdjsFeature = (attributes & JsRuntimeAttributeEnableSimdjsFeature) != 0;
+        ThreadContext * threadContext = HeapNew(ThreadContext, policyManager, threadService, enableExperimentalFeatures, enableSimdjsFeature);
 
         if (((attributes & JsRuntimeAttributeDisableBackgroundWork) != 0)
 #ifdef ENABLE_DEBUG_CONFIG_OPTIONS

deps/chakrashim/core/lib/jsrt/chakracommon.h

@@ -313,7 +313,13 @@
         ///     Calling <c>JsSetException</c> will also dispatch the exception to the script debugger
         ///     (if any) giving the debugger a chance to break on the exception.
         /// </summary>
-        JsRuntimeAttributeDispatchSetExceptionsToDebugger = 0x00000040
+        JsRuntimeAttributeDispatchSetExceptionsToDebugger = 0x00000040,
+        /// <summary>
+        ///     Runtime will enable Simdjs experimental feature. Valid only if used with
+        ///     JsRuntimeAttributeEnableExperimentalFeatures
+        /// </summary>
+        JsRuntimeAttributeEnableSimdjsFeature = 0x00000080
+
     } JsRuntimeAttributes;
 
     /// <summary>