misc: update spirv tools revision

Change-Id: I8abb31de604ae4a50bb4900e9498de9953c5646b
diff --git a/spirv-tools_revision b/spirv-tools_revision
index d019f66..2df4b89 100644
--- a/spirv-tools_revision
+++ b/spirv-tools_revision
@@ -1 +1 @@
-37e4600c3efad7b1cfdc1df70a977be82eb3c811
+1a9385bbd0e6eae188c14302cf37c415ecc8b698