Support symlinking to dart-sdk executables on Linux and Mac.

sdk/bin/dartanalyzer_developer

Index: sdk/bin/dartanalyzer_developer
diff --git a/sdk/bin/dartanalyzer_developer b/sdk/bin/dartanalyzer_developer
index 5639355e16fd89d68c6820922a0216e22b0f6efa..94d9346590f9043d628d39485421c3142a3d465b 100755
--- a/sdk/bin/dartanalyzer_developer
+++ b/sdk/bin/dartanalyzer_developer
@@ -8,14 +8,6 @@
 # the testing infrastructure.
 set -e
 
-function follow_links() {
-  while [ -h "$1" ]; do
-    # On Mac OS, readlink -f doesn't work.
-    1="$(readlink "$1")"
-  done
-  echo "$1"
-}
-
 FOUND_BATCH=0
 for ARG in "$@"
 do
@@ -28,12 +20,11 @@ do
   esac
 done
 
-# Unlike $0, $BASH_SOURCE points to the absolute path of this file.
-PROG_NAME="$(follow_links "$BASH_SOURCE")"
-
-# Handle the case where the binary dir has been symlinked to.
-CUR_DIR="$(follow_links "$(cd "${PROG_NAME%/*}" ; pwd -P)")"
-
+# Setting BIN_DIR this way is ugly, but is needed to handle the case where
+# dart-sdk/bin or the script itself has been symlinked to. On MacOS, readlink -f
+# doesn't work with this case.
+SCRIPT=`readlink "$0" || echo "$0"`
+CUR_DIR="$(cd "${SCRIPT%/*}" ; pwd -P)"
 SDK_DIR="$(cd "${CUR_DIR}/.." ; pwd -P)"
 
 if [ -z "$DART_CONFIGURATION" ];