Update LLVM Version (#276)

Author: Ivy Zhang

cmake/llvm-version.txt

@@ -1 +1 @@
-8345289ded788f4df79f59df76df0c0437c3df64
+f06563a5c0d239a6b98f74db522681613254ad08

lib/gc/Transforms/LowerToTileVector.cpp

@@ -656,7 +656,8 @@ struct LowerToTileVectorPass
     // transpose or braodcast semantic etc.
     vector::populateVectorTransferPermutationMapLoweringPatterns(secondPattern);
     // Remove unnessary broadcast operation
-    vector::populateSinkVectorBroadcastPatterns(secondPattern);
+    // TODO: disable this pattern until the following support is ready
+    // vector::populateSinkVectorBroadcastPatterns(secondPattern);
     // Second fold (with the help of the `applyPatternsAndFoldGreedily`
     // function) can help us to eliminate redundant operation like consecutive
     // read and write.

scripts/compile.sh

@@ -163,6 +163,7 @@ build_llvm() {
 get_llvm() {
     if [ ! -z "$DEV_BUILD" ]; then
         mkdir -p "$EXTERNALS_DIR"
+        cd "$EXTERNALS_DIR"
         build_llvm
         cd "$PROJECT_DIR"
         return 0