Fix dart_analyzer finding SDK after core_runtime.dart rename

compiler/scripts/dart_analyzer.bat

 @echo off
 rem #!/bin/bash --posix
 rem Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 rem for details. All rights reserved. Use of this source code is governed by a
 rem BSD-style license that can be found in the LICENSE file.
 rem 
 rem stop if any of the steps fails
 rem set -e
 rem 
 
@@ skipping 26 matching lines @@
 rem       ;;
 rem     *)
 rem       ;;
 rem   esac
 rem done
 rem 
 
 setlocal EnableDelayedExpansion
 set DART_SDK=""
 if [%FOUND_SDK%] == [0] (
-  if exist "%DART_ANALYZER_HOME%\lib\core\core_runtime.dart" (
+  if exist "%DART_ANALYZER_HOME%\lib\core\core.dart" (
     set DART_SDK=--dart-sdk %DART_ANALYZER_HOME%
   ) else (
     for /f %%i in ('echo %DART_ANALYZER_HOME%') do set DART_SDK_HOME=%%~dpi\dart-sdk
     if exist "!DART_SDK_HOME!" (
       set DART_SDK=--dart-sdk !DART_SDK_HOME!
     ) else (
       for /f %%j in ('call echo !DART_SDK_HOME!') do set DART_SDK_HOME=%%~dpj\dart-sdk
       if exist "!DART_SDK_HOME!" (
         set DART_SDK=--dart-sdk !DART_SDK_HOME!
       ) else (
         echo Couldn't find Dart SDK. Specify with --dart-sdk cmdline argument
       )
     )
   )
 )
 endlocal & set "DART_SDK=%DART_SDK%" & set "DART_SDK_HOME=%DART_SDK_HOME%"
 
 rem DART_SDK=""
 rem if [ $FOUND_SDK = 0 ] ; then
-rem   if [ -f $DART_ANALYZER_HOME/lib/core/core_runtime.dart ] ; then
+rem   if [ -f $DART_ANALYZER_HOME/lib/core/core.dart ] ; then
 rem     DART_SDK="--dart-sdk $DART_ANALYZER_HOME"
 rem   else
 rem     DART_SDK_HOME=$(dirname $DART_ANALYZER_HOME)/dart-sdk
 rem     if [ -d $DART_SDK_HOME ] ; then
 rem       DART_SDK="--dart-sdk $DART_SDK_HOME"
 rem     else
 rem       DART_SDK_HOME=$(dirname $DART_SDK_HOME)/dart-sdk
 rem       if [ -d $DART_SDK_HOME ] ; then
 rem         DART_SDK="--dart-sdk $DART_SDK_HOME"
 rem       else
@@ skipping 51 matching lines @@
 rem     EXTRA_JVMARGS+=" -client "
 rem   fi
 rem fi
 rem 
 
 java %EXTRA_JVMARGS% %DART_JVMARGS% -ea -classpath "@CLASSPATH@" ^
   com.google.dart.compiler.DartCompiler %DART_SDK% %*
 
 rem exec java $EXTRA_JVMARGS $DART_JVMARGS -ea -classpath "@CLASSPATH@" \
 rem   com.google.dart.compiler.DartCompiler ${DART_SDK} $@
-rem 
+rem