More envsetup.sh cleanup -- move these to standalone scripts

Bug: 340648588
Test: Run them
Change-Id: I11d086bcaa2f9eb52f7c556d94666321010b75fa

bin/is64bit

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# Copyright (C) 2024 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Read the ELF header from /proc/$PID/exe to determine if the process is
+# 64-bit.
+
+set -e
+
+local PID="$1"
+if [ "$PID" ] ; then
+    if [[ "$(adb shell cat /proc/$PID/exe | xxd -l 1 -s 4 -p)" -eq "02" ]] ; then
+        echo "64"
+    else
+        echo ""
+    fi
+else
+    echo ""
+fi
+