Roll shaderc from 1402ed576596 to fdad1302b17b (1 revision)

https://chromium.googlesource.com/external/github.com/google/shaderc/+log/1402ed576596..fdad1302b17b

2020-07-08 bclayton@google.com Remove pushing / popping -fPIC for glslang  (#1098)

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/shaderc-chromium-autoroll
Please CC radial-bots+chrome-roll@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

Tbr: radial-bots+chrome-roll@google.com
Change-Id: I8973c3be09724e7932c111ed00151d62e6b972de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2287778Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#786318}

DEPS

@@ -314,7 +314,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'shaderc_revision': '1402ed576596f53eaf3f8d390a9e1defbeffd014',
+  'shaderc_revision': 'fdad1302b17ba4ad40187fe9322c730f919573a1',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.