Revert of Remove SIMD.js from V8.

src/messages.h

Index: src/messages.h
diff --git a/src/messages.h b/src/messages.h
index d244e0bffdf10908ea3369df5d6137d52be30c27..221236d1db6c60e263e7b7b367bfccde9da375ed 100644
--- a/src/messages.h
+++ b/src/messages.h
@@ -316,6 +316,7 @@
   T(InvalidInOperatorUse, "Cannot use 'in' operator to search for '%' in %")   \
   T(InvalidRegExpExecResult,                                                   \
     "RegExp exec method returned something other than an Object or null")      \
+  T(InvalidSimdOperation, "% is not a valid type for this SIMD operation.")    \
   T(IteratorResultNotAnObject, "Iterator result % is not an object")           \
   T(IteratorValueNotAnObject, "Iterator value % is not an entry object")       \
   T(LanguageID, "Language ID should be string or object.")                     \
@@ -478,6 +479,7 @@
   T(SymbolKeyFor, "% is not a symbol")                                         \
   T(SymbolToNumber, "Cannot convert a Symbol value to a number")               \
   T(SymbolToString, "Cannot convert a Symbol value to a string")               \
+  T(SimdToNumber, "Cannot convert a SIMD value to a number")                   \
   T(ThrowMethodMissing, "The iterator does not provide a 'throw' method.")     \
   T(UndefinedOrNullToObject, "Cannot convert undefined or null to object")     \
   T(ValueAndAccessor,                                                          \
@@ -517,6 +519,8 @@
   T(InvalidTypedArrayAlignment, "% of % should be a multiple of %")            \
   T(InvalidTypedArrayIndex, "Invalid typed array index")                       \
   T(InvalidTypedArrayLength, "Invalid typed array length")                     \
+  T(InvalidSimdIndex, "Index out of bounds for SIMD operation")                \
+  T(InvalidSimdLaneValue, "Lane value out of bounds for SIMD operation")       \
   T(LetInLexicalBinding, "let is disallowed as a lexically bound name")        \
   T(LocaleMatcher, "Illegal value for localeMatcher:%")                        \
   T(NormalizationForm, "The normalization form should be one of %.")           \