scripts:iree: Downgrade the iree commit consistency check into a message

So we don't force the twice-a-day sync.

Change-Id: I0ffb58cb819b1ecc0824cdc0bb98beeddf283277

check-iree-commit.sh

diff --git a/check-iree-commit.sh b/check-iree-commit.sh
index 222be7b..9942f11 100755
--- a/check-iree-commit.sh
+++ b/check-iree-commit.sh
@@ -33,7 +33,6 @@
 if grep -q "${COMMIT}" "${IREE_COMPILER_DIR}/tag"; then
   echo "Source code commit matches with the compiler."
 else
-  echo "Source code commit mismatches with the compiler. Please re-download the \
-compiler ('m iree_compiler') and resync the repo."
-  exit 1
+  echo "!!! Source code commit mismatches with the compiler. Please re-download \
+the compiler ('m iree_compiler') and resync the repo if you hit the compiler error.!!!"
 fi