Squashed 'third_party/SPIRV-Tools/' changes from 8aa423930..8910ea5f1

8910ea5f1 Fix Wrange-loop-analysis warnings in SPIRV-Tools. (#3201)
c316fb15f Add missing dependencies when generating spvtools_core_tables (#3199)
03c9effb5 Brief guide to writing a spirv-fuzz fuzzer pass (#3190)
dea1040fa Fix ignored const qualifier warning in static_cast (#3197)
4a80497a8 Make spvOpcodeString part of the public API (#3174)
03794b8f5 Fix static libraries linking order (#3189)
79f8caf91 vscode: Add missing fields to schema.Opcode (#3169)
4d912f4e6 spirv-val: Add support for SPV_AMD_shader_image_load_store_lod (#3186)
77fefe765 spirvfuzz: Fix type-related bug, change undef to zero, and add assert (#3188)
6c218ec60 spirv-fuzz: Fuzzer pass that adds access chains (#3182)
77fb303e5 spirv-fuzz: Fuzzer pass to add function calls (#3178)
3d4a0dd48 spirv-fuzz: Ensure that donated variables are always initialized (#3181)
fe10239f9 spirv-fuzz: Add fuzzer passes to add loads/stores (#3176)
1f03ac102 spirv-fuzz: Fuzzer passes to add local and global variables (#3175)
9e52bc0d0 utils/vscode: LSP - Support OpExtInst (#3140)
a3b5ad909 Fix typos in opt's help. Update environment version. (#3170)
da5457f6b Start SPIRV-Tools v2020.2
8dd174809 Finalize SPIRV-Tools v2020.1
76616bab6 Update CHANGES
bb56e892f spirv-fuzz: Fuzzer pass to add composite types (#3171)
fdd0c8776 Update script that checks copyright years. (#3173)
b7e0998e3 spirv-fuzz: Disallow copying of null and undefined pointers (#3172)
a9624b4d5 Handle TimeAMD in AmdExtensionToKhrPass. (#3168)
ddcc11763 Update CHANGES
0265a9d4d Implement constant folding for many transcendentals (#3166)
7a2d408de Fix typo in comment. (#3163)
1fc7a9ec7 spirv-fuzz: Arbitrary variable facts (#3165)
dd3f8d492 spirv-fuzz: Add outlining test (#3164)
521223b70 spirv-fuzz: Make functions "livesafe" during donation (#3146)
97f1d485b Dead branch elim fix (#3160)
1b3441036 Fix chromium build (#3152)
5d786f6cc Clarify mapping of target env to SPIR-V version (#3150)
e7afeb060 Use dummy switch instead of dummy loop in MergeReturn pass. (#3151)
6729c4a7c Fix structured exit validation (#3141)
bb236c326 Add spvParseVulkanEnv (#3142)
dd37d73c5 Handle conflict between debug info and existing validation rule (#3104)
b97057e7f Use spirv-headers' BUILD.gn (#3148)
6a1a1b326 Roll external/spirv-headers/ af64a9e82..dc77030ac (4 commits) (#3147)
ab7ac60f1 spirv-fuzz: Refactoring and type-related fixes (#3144)
323a81fc5 Validate Vulkan 1.2 capabilities
d46a1b048 Add basic support for Vulkan 1.2: SPV_ENV_VULKAN_1_2
f8d7df760 Fix OpLine bug of merge-blocks pass (#3130)
8013d477a spirv-fuzz: add dead blocks (#3135)
18b3b9456 Remove names and decorations of imported symbols (#3081)
fb2e81981 Fix GN build for OpenCL.DebugInfo.100 update (#3134)
c86dc0bcd Fix bad parameter names in error message (#3129)
899735f45 Revert PR #3093 (#3131)
a466b99db Disallow forward references in arrays (#3093)
31acc7882 spirv-fuzz: Add fuzzer pass to perform module donation (#3117)
c8bf14393 GetOperandConstants operand can be const (#3126)

git-subtree-dir: third_party/SPIRV-Tools
git-subtree-split: 8910ea5f1c7bc38f79a8b70b265cd9d1571f4b56
diff --git a/CHANGES b/CHANGES
index 2f2968e..48c93a4 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,7 +1,32 @@
 Revision history for SPIRV-Tools
 
-v2020.1-dev 2019-12-11
- - Start v2020.1-dev
+v2020.2-dev 2020-02-03
+ - Start v2020.2-dev
+
+v2020.1 2020-02-03
+ - General:
+   - Add support for SPV_KHR_non_semantic_info (#3110)
+   - Support OpenCL.DebugInfo.100 extended instruction set (#3080)
+   - Added support for Vulkan 1.2
+   - Add API function to better handle getting the necessary environment (#3142)
+   - Clarify mapping of target env to SPIR-V version (#3150)
+   - Implement constant folding for many transcendentals (#3166)
+ - Optimizer
+   - Change default version for CreatInstBindlessCheckPass to 2 (#3096, #3119)
+   - Better handling of OpLine on merge blocks (#3130)
+   - Use dummy switch instead of dummy loop in MergeReturn pass. (#3151)
+   - Handle TimeAMD in AmdExtensionToKhrPass. (#3168)
+ - Validator
+   - Fix structured exit validation (#3141)
+ - Reduce
+ - Fuzz
+   - Fuzzer pass to merge blocks (#3097)
+   - Transformation to add a new function to a module (#3114)
+   - Add fuzzer pass to perform module donation (#3117)
+   - Fuzzer passes to create and branch to new dead blocks (#3135)
+   - Fuzzer pass to add composite types (#3171)
+ - Linker:
+   - Remove names and decorations of imported symbols (#3081)
 
 v2019.5 2019-12-11
  - General: