Temporarily pin IREE release

Unblock the breakage from https://github.com/openxla/iree/issues/16026

Bug: 318408783
Change-Id: I73a4d37b743dfd87ec6fe46dce97b93473a5cbf6

platforms/nexus/iree.mk

diff --git a/platforms/nexus/iree.mk b/platforms/nexus/iree.mk
index 782d93b..f4777fd 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/318408783): unpin the IREE 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-20231228.752
 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..f71bf85 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/318408783): unpin the IREE 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-20231228.752
 iree_commit_check:
 	$(ROOTDIR)/scripts/check-iree-commit.sh "$(IREE_SRC)" "$(IREE_COMPILER_DIR)"