Roll SPIRV-Tools from fba90d6b0a23 to 2c1ff230c26d (2 revisions)

fba90d6b0a..2c1ff230c2

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/spirv-tools-angle-autoroll
Please CC ianelliott@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Bug: None
Tbr: ianelliott@google.com
Change-Id: I6150a2e88d63d09535cf100567884997ef60d83f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2280825
Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -57,7 +57,7 @@ vars = {
   'spirv_headers_revision': 'ac638f1815425403e946d0ab78bac71d2bdbf3be',
 
   # Current revision of SPIRV-Tools for Vulkan.
-  'spirv_tools_revision': 'fba90d6b0a23ae2331273aedabc569a3816750ac',
+  'spirv_tools_revision': '2c1ff230c26d67655e5b0ef27ca3c4371d7d5b3e',
 
   # Current revision of Khronos Vulkan-Headers.
   'vulkan_headers_revision': '8188e3fbbc105591064093440f88081fb957d4f0',