Temporarily pin IREE revision

To avoid the breakage introduced in https://github.com/iree-org/iree/pull/18220#discussion_r1718883771

Bypass-Presubmit-Reason: tested in topic

Change-Id: Id6c72084375c958e37a49e94a8ed1f7cba11ef2a

platforms/nexus/iree.mk

diff --git a/platforms/nexus/iree.mk b/platforms/nexus/iree.mk
index 782d93b..0abd8e6 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: unpin IREE revision
 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-20240815.986
 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..6283fe8 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: unpin IREE revision
 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-20240815.986
 iree_commit_check:
 	$(ROOTDIR)/scripts/check-iree-commit.sh "$(IREE_SRC)" "$(IREE_COMPILER_DIR)"