Changed JS/TS codegen to use stable non-compiler dependent hash.

Different implementations of std::hash kept littering commits with
namespace changes.

Change-Id: Ic2d4fdcd76f8fef9802bc1572eb74ae7427085e3

src/idl_gen_js.cpp

@@ -507,8 +507,7 @@ class JsGenerator : public BaseGenerator {
   }
 
   static std::string GenFileNamespacePrefix(const std::string &file) {
-    return "NS" + std::to_string(static_cast<unsigned long long>(
-                      std::hash<std::string>()(file)));
+    return "NS" + std::to_string(HashFnv1a<uint64_t>(file.c_str()));
   }
 
   static std::string GenPrefixedImport(const std::string &full_file_name,

tests/namespace_test/namespace_test2_generated.ts

 // automatically generated by the FlatBuffers compiler, do not modify
 
-import * as NS9459827973991502386 from "./namespace_test1_generated";
+import * as NS8755221360535654258 from "./namespace_test1_generated";
 /**
  * @constructor
  */
@@ -33,24 +33,24 @@ static getRootAsTableInFirstNS(bb:flatbuffers.ByteBuffer, obj?:TableInFirstNS):T
  * @param NamespaceA.NamespaceB.TableInNestedNS= obj
  * @returns NamespaceA.NamespaceB.TableInNestedNS|null
  */
-fooTable(obj?:NS9459827973991502386.NamespaceA.NamespaceB.TableInNestedNS):NS9459827973991502386.NamespaceA.NamespaceB.TableInNestedNS|null {
+fooTable(obj?:NS8755221360535654258.NamespaceA.NamespaceB.TableInNestedNS):NS8755221360535654258.NamespaceA.NamespaceB.TableInNestedNS|null {
   var offset = this.bb!.__offset(this.bb_pos, 4);
-  return offset ? (obj || new NS9459827973991502386.NamespaceA.NamespaceB.TableInNestedNS).__init(this.bb!.__indirect(this.bb_pos + offset), this.bb!) : null;
+  return offset ? (obj || new NS8755221360535654258.NamespaceA.NamespaceB.TableInNestedNS).__init(this.bb!.__indirect(this.bb_pos + offset), this.bb!) : null;
 };
 
 /**
  * @returns NamespaceA.NamespaceB.EnumInNestedNS
  */
-fooEnum():NS9459827973991502386.NamespaceA.NamespaceB.EnumInNestedNS {
+fooEnum():NS8755221360535654258.NamespaceA.NamespaceB.EnumInNestedNS {
   var offset = this.bb!.__offset(this.bb_pos, 6);
-  return offset ? /**  */ (this.bb!.readInt8(this.bb_pos + offset)) : NS9459827973991502386.NamespaceA.NamespaceB.EnumInNestedNS.A;
+  return offset ? /**  */ (this.bb!.readInt8(this.bb_pos + offset)) : NS8755221360535654258.NamespaceA.NamespaceB.EnumInNestedNS.A;
 };
 
 /**
  * @param NamespaceA.NamespaceB.EnumInNestedNS value
  * @returns boolean
  */
-mutate_foo_enum(value:NS9459827973991502386.NamespaceA.NamespaceB.EnumInNestedNS):boolean {
+mutate_foo_enum(value:NS8755221360535654258.NamespaceA.NamespaceB.EnumInNestedNS):boolean {
   var offset = this.bb!.__offset(this.bb_pos, 6);
 
   if (offset === 0) {
@@ -65,9 +65,9 @@ mutate_foo_enum(value:NS9459827973991502386.NamespaceA.NamespaceB.EnumInNestedNS
  * @param NamespaceA.NamespaceB.StructInNestedNS= obj
  * @returns NamespaceA.NamespaceB.StructInNestedNS|null
  */
-fooStruct(obj?:NS9459827973991502386.NamespaceA.NamespaceB.StructInNestedNS):NS9459827973991502386.NamespaceA.NamespaceB.StructInNestedNS|null {
+fooStruct(obj?:NS8755221360535654258.NamespaceA.NamespaceB.StructInNestedNS):NS8755221360535654258.NamespaceA.NamespaceB.StructInNestedNS|null {
   var offset = this.bb!.__offset(this.bb_pos, 8);
-  return offset ? (obj || new NS9459827973991502386.NamespaceA.NamespaceB.StructInNestedNS).__init(this.bb_pos + offset, this.bb!) : null;
+  return offset ? (obj || new NS8755221360535654258.NamespaceA.NamespaceB.StructInNestedNS).__init(this.bb_pos + offset, this.bb!) : null;
 };
 
 /**
@@ -89,8 +89,8 @@ static addFooTable(builder:flatbuffers.Builder, fooTableOffset:flatbuffers.Offse
  * @param flatbuffers.Builder builder
  * @param NamespaceA.NamespaceB.EnumInNestedNS fooEnum
  */
-static addFooEnum(builder:flatbuffers.Builder, fooEnum:NS9459827973991502386.NamespaceA.NamespaceB.EnumInNestedNS) {
-  builder.addFieldInt8(1, fooEnum, NS9459827973991502386.NamespaceA.NamespaceB.EnumInNestedNS.A);
+static addFooEnum(builder:flatbuffers.Builder, fooEnum:NS8755221360535654258.NamespaceA.NamespaceB.EnumInNestedNS) {
+  builder.addFieldInt8(1, fooEnum, NS8755221360535654258.NamespaceA.NamespaceB.EnumInNestedNS.A);
 };
 
 /**