Roll SPIRV-Tools from efaae24d0006 to 91c50e3fc993 (2 revisions)

efaae24d00..91c50e3fc9

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 cwallez@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: cwallez@google.com
Change-Id: Id56272d47103e0df701dfc997927806851099369
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2272381
Reviewed-by: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: angle-autoroll <angle-autoroll@skia-public.iam.gserviceaccount.com>

DEPS

@@ -46,7 +46,7 @@ vars = {
   'spirv_headers_revision': 'ac638f1815425403e946d0ab78bac71d2bdbf3be',
 
   # Current revision of SPIRV-Tools for Vulkan.
-  'spirv_tools_revision': 'efaae24d00067d46f8a7447b8203f901443ddd06',
+  'spirv_tools_revision': '91c50e3fc9931a32f116ff5526a01eacbd2bde40',
 
   # Current revision of Khronos Vulkan-Headers.
   'vulkan_headers_revision': '8188e3fbbc105591064093440f88081fb957d4f0',