Temporarily pin IREE release to resolve multiple issues

Bug: 301616633
Bug: 301616627
Change-Id: I7a68437fdf14731637d88a1bf8b9638238ecd5b5

platforms/nexus/iree.mk

diff --git a/platforms/nexus/iree.mk b/platforms/nexus/iree.mk
index 782d93b..42bbb30 100644
--- a/platforms/nexus/iree.mk
+++ b/platforms/nexus/iree.mk
@@ -69,8 +69,9 @@
 # the `iree_runtime` target. The outputs of this target are placed in
 # out/host/iree_compiler.
 #
+# TODO(b/301616633): Unpin the release
 iree_compiler: | $(IREE_COMPILER_DIR)
-	$(ROOTDIR)/scripts/download_iree_compiler.py --iree_compiler_dir "$(IREE_COMPILER_DIR)"
+	$(ROOTDIR)/scripts/download_iree_compiler.py --iree_compiler_dir "$(IREE_COMPILER_DIR)" --tag_name candidate-20230921.652
 iree_commit_check:
 	$(ROOTDIR)/scripts/check-iree-commit.sh "$(IREE_SRC)" "$(IREE_COMPILER_DIR)"
 

platforms/shodan/iree.mk

diff --git a/platforms/shodan/iree.mk b/platforms/shodan/iree.mk
index cec2ac2..518d89c 100644
--- a/platforms/shodan/iree.mk
+++ b/platforms/shodan/iree.mk
@@ -69,8 +69,9 @@
 # the `iree_runtime` target. The outputs of this target are placed in
 # out/host/iree_compiler.
 #
+# TODO(b/301616633): unpin the release.
 iree_compiler: | $(IREE_COMPILER_DIR)
-	$(ROOTDIR)/scripts/download_iree_compiler.py --iree_compiler_dir "$(IREE_COMPILER_DIR)"
+	$(ROOTDIR)/scripts/download_iree_compiler.py --iree_compiler_dir "$(IREE_COMPILER_DIR)" --tag_name candidate-20230921.652
 iree_commit_check:
 	$(ROOTDIR)/scripts/check-iree-commit.sh "$(IREE_SRC)" "$(IREE_COMPILER_DIR)"