Fix SIMD CanvasKit build to output to the expected directory.

the BUILD_DIR in compile.sh was not being set properly prior to this
change, resulting in build output in the `skia/out/canvaskit_wasm`
directory instead of the `skia/out/canvaskit_wasm_experimental_simd`
directory.

Change-Id: Idb599d4885a16c10848e4c90954e778f63065c45
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/306299
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Nathaniel Nifong <nifong@google.com>

Author: Elliot Evans

modules/canvaskit/compile.sh

@@ -47,15 +47,16 @@ elif [[ $@ == *profiling* ]]; then
   echo "Building a build for profiling"
   RELEASE_CONF+=" --profiling-funcs --closure 0"
   BUILD_DIR=${BUILD_DIR:="out/canvaskit_wasm_profile"}
+elif [[ $@ == *simd* ]]; then
+  echo "Building with SIMD operations"
+  BUILD_DIR=${BUILD_DIR:="out/canvaskit_wasm_experimental_simd"}
 else
   BUILD_DIR=${BUILD_DIR:="out/canvaskit_wasm"}
 fi
 
 if [[ $@ == *simd* ]]; then
-  echo "Building with SIMD operations"
   RELEASE_CONF+=" -msimd128"
   EXTRA_CFLAGS+=" \"-msimd128\""
-  BUILD_DIR=${BUILD_DIR:="out/canvaskit_wasm_experimental_simd"}
 fi
 
 mkdir -p $BUILD_DIR