Move the IDENTITY_MATRIX constant into src/core/core_utils.js (PR 19772 follow-up)

After the changes in PR 19772 the `IDENTITY_MATRIX` constant is now only used on the worker-thread, which leads to Webpack marking the code as unused in the *built* `pdf.mjs` file; see https://phabricator.services.mozilla.com/D244533#change-8oITAexCvrlQ

Author: Snuffleupagus

src/core/annotation.js

@@ -25,7 +25,6 @@ import {
   BASELINE_FACTOR,
   FeatureTest,
   getModificationDate,
-  IDENTITY_MATRIX,
   info,
   isArrayEqual,
   LINE_DESCENT_FACTOR,
@@ -44,6 +43,7 @@ import {
   getInheritableProperty,
   getParentToUpdate,
   getRotationMatrix,
+  IDENTITY_MATRIX,
   isNumberArray,
   lookupMatrix,
   lookupNormalRect,

src/core/core_utils.js

@@ -30,6 +30,8 @@ const PDF_VERSION_REGEXP = /^[1-9]\.\d$/;
 const MAX_INT_32 = 2 ** 31 - 1;
 const MIN_INT_32 = -(2 ** 31);
 
+const IDENTITY_MATRIX = [1, 0, 0, 1, 0, 0];
+
 function getLookupTableFactory(initializer) {
   let lookup;
   return function () {
@@ -722,6 +724,7 @@ export {
   getParentToUpdate,
   getRotationMatrix,
   getSizeInBytes,
+  IDENTITY_MATRIX,
   isAscii,
   isBooleanArray,
   isNumberArray,

src/core/evaluator.js

@@ -19,7 +19,6 @@ import {
   DrawOPS,
   FONT_IDENTITY_MATRIX,
   FormatError,
-  IDENTITY_MATRIX,
   info,
   isArrayEqual,
   normalizeUnicode,
@@ -36,6 +35,7 @@ import { compileType3Glyph, FontFlags } from "./fonts_utils.js";
 import { ErrorFont, Font } from "./fonts.js";
 import {
   fetchBinaryData,
+  IDENTITY_MATRIX,
   isNumberArray,
   lookupMatrix,
   lookupNormalRect,

src/core/pattern.js

@@ -16,14 +16,14 @@
 import {
   assert,
   FormatError,
-  IDENTITY_MATRIX,
   info,
   MathClamp,
   unreachable,
   Util,
   warn,
 } from "../shared/util.js";
 import {
+  IDENTITY_MATRIX,
   isBooleanArray,
   isNumberArray,
   lookupMatrix,

src/shared/util.js

@@ -25,7 +25,6 @@ const isNodeJS =
   !process.versions.nw &&
   !(process.versions.electron && process.type && process.type !== "browser");
 
-const IDENTITY_MATRIX = [1, 0, 0, 1, 0, 0];
 const FONT_IDENTITY_MATRIX = [0.001, 0, 0, 0.001, 0, 0];
 
 // Represent the percentage of the height of a single-line field over
@@ -1303,7 +1302,6 @@ export {
   getUuid,
   getVerbosityLevel,
   hexNumbers,
-  IDENTITY_MATRIX,
   ImageKind,
   info,
   InvalidPDFException,