Roll SPIRV-Tools from fc0dc3a9c734 to fba90d6b0a23 (2 revisions)

fc0dc3a9c7..fba90d6b0a

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: I7f1698096e261c70e9a2fa7680416a4ebf77d517
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2277611
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': 'fc0dc3a9c734f798f85a8433cbd99306dbe82825',
+  'spirv_tools_revision': 'fba90d6b0a23ae2331273aedabc569a3816750ac',
 
   # Current revision of Khronos Vulkan-Headers.
   'vulkan_headers_revision': '8188e3fbbc105591064093440f88081fb957d4f0',