Remove path.normalize from node file reading code. NFC (#23087)

I don't see any reason to perform normalization here. The file read
operations will happily accept relative paths and resolve them
internally.

Author: sbc100

src/node_shell_read.js

@@ -5,9 +5,8 @@
  */
 
 readBinary = (filename) => {
-  // We need to re-wrap `file://` strings to URLs. Normalizing isn't
-  // necessary in that case, the path should already be absolute.
-  filename = isFileURI(filename) ? new URL(filename) : nodePath.normalize(filename);
+  // We need to re-wrap `file://` strings to URLs.
+  filename = isFileURI(filename) ? new URL(filename) : filename;
   var ret = fs.readFileSync(filename);
 #if ASSERTIONS
   assert(ret.buffer);
@@ -17,7 +16,7 @@ readBinary = (filename) => {
 
 readAsync = (filename, binary = true) => {
   // See the comment in the `readBinary` function.
-  filename = isFileURI(filename) ? new URL(filename) : nodePath.normalize(filename);
+  filename = isFileURI(filename) ? new URL(filename) : filename;
   return new Promise((resolve, reject) => {
     fs.readFile(filename, binary ? undefined : 'utf8', (err, data) => {
       if (err) reject(err);

test/other/codesize/test_codesize_cxx_ctors1.gzsize

@@ -1 +1 @@
-8534
+8520

test/other/codesize/test_codesize_cxx_ctors1.jssize

@@ -1 +1 @@
-20856
+20825

test/other/codesize/test_codesize_cxx_ctors2.gzsize

@@ -1 +1 @@
-8518
+8504

test/other/codesize/test_codesize_cxx_ctors2.jssize

@@ -1 +1 @@
-20824
+20793

test/other/codesize/test_codesize_cxx_except.gzsize

@@ -1 +1 @@
-9563
+9550

test/other/codesize/test_codesize_cxx_except.jssize

@@ -1 +1 @@
-24699
+24668

test/other/codesize/test_codesize_cxx_except_wasm.gzsize

@@ -1 +1 @@
-8500
+8489

test/other/codesize/test_codesize_cxx_except_wasm.jssize

@@ -1 +1 @@
-20750
+20718

test/other/codesize/test_codesize_cxx_except_wasm_exnref.gzsize

@@ -1 +1 @@
-8500
+8489