Roll SPIRV-Tools from fcb22ecf0f7e to d91afd8de27a (13 revisions)

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/fcb22ecf0f7e..d91afd8de27a

2020-10-02 vasniktel@gmail.com spirv-fuzz: Refactor fact manager tests (#3879)
2020-10-02 afdx@google.com spirv-fuzz: Integrate spirv-reduce with shrinker (#3849)
2020-10-02 afdx@google.com spirv-fuzz: Only recommend passes when a pass had an effect (#3863)
2020-10-02 stefano.milizia00@gmail.com spirv-fuzz: Merge the return instructions in a function (#3838)
2020-10-01 jaebaek@google.com Debug info preservation in redundancy-elimination pass (#3839)
2020-10-01 jaebaek@google.com Debug info preservation in if-conversion pass (#3861)
2020-10-01 vasniktel@gmail.com spirv-fuzz: Refactor conditions in the fact manager (#3867)
2020-10-01 vasniktel@gmail.com spirv-fuzz: TransformationWrapRegionInSelection (#3674)
2020-10-01 afdx@google.com spirv-fuzz: Enable some passes with high probability (#3860)
2020-10-01 afdx@google.com spirv-fuzz: Do not add constants for Block-decorated structs (#3862)
2020-10-01 vasniktel@gmail.com spirv-fuzz: Fix to FuzzerPassFlattenConditionalBranches (#3865)
2020-09-30 vasniktel@gmail.com spirv-fuzz: Fix TransformationRecordSynonymousConstants (#3868)
2020-09-30 afdx@google.com spirv-fuzz: Fix flatten conditional branch transformation (#3859)

If this roll has caused a breakage, revert this CL and stop the roller
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https://autoroll.skia.org/r/spirv-tools-chromium-autoroll
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Tbr: radial-bots+chrome-roll@google.com,jonahr@google.com
Change-Id: I2725c067453e4ae2df6a28707527831348bb7209
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2445053Reviewed-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@{#813119}

DEPS

@@ -302,7 +302,7 @@ 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.
-  'spv_tools_revision': 'fcb22ecf0f7e7baa761c7ab01317cca5b14fcc35',
+  'spv_tools_revision': 'd91afd8de27a064f938a196fdea2ace234971faa',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.