Merge pull requests KhronosGroup#5865, KhronosGroup#5860, and KhronosGroup#5859

Add validation for SPV_NV_tensor_addressing and SPV_NV_cooperative_matrix2, and update the CHANGES file.

* Add validation for SPV_NV_tensor_addressing and SPV_NV_cooperative_matrix2 in `source/val/validate.cpp`.
* Add StorageImageWriteWithoutFormat to trimm pass in `source/opt/loop_unroller.cpp`.
* Add KHR_fragment_shading_rate to allowlist in `source/opt/loop_fusion.cpp`.
* Update the CHANGES file to mention the changes from pull requests KhronosGroup#5865, KhronosGroup#5860, and KhronosGroup#5859.

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Author: akaday

CHANGES

@@ -834,7 +834,7 @@ v2018.6 2018-11-07
    - Added support for VK_KHR_shader_atddomic_int64.
    - Added validation for execution modes.
    - Added validation for runtime array layouts.
-   - Added validation for 8-bit storage.
+   - Added validation of 8-bit storage.
    - Added validation of OpPhi instructions with pointer result type.
    - Added checks for the Vulkan memory model.
    - Validate MakeTexelAvailableKHR and MakeTexelVisibleKHR
@@ -1127,9 +1127,9 @@ v2018.0 2018-02-02
    - PR 1198: Optimizer: Fix CCP in presence of matrix constants.
    - #1199: Optimizer: Fix CCP: don't propagate spec constants.
    - #1203: Optimizer: Fix common uniform elim bug introduced by refactoring.
-   - #1210: Optimizer: Aggressive dead code elimination: Fix 'break' identification.
-   - #1212: Optimizer: Aggressive dead code elimination: Was skipping too many instructions.
-   - #1214: Optimizer: Aggressive dead code elimination: Fix infinite loop.
+   - #1210: Optimizer: Aggressive dead code elim: Fix 'break' identification.
+   - #1212: Optimizer: Aggressive dead code elim: Was skipping too many instructions.
+   - #1214: Optimizer: Aggressive dead code elim: Fix infinite loop.
    - #1228: Optimizer: Fix CCP: Handling of varying Phi nodes; was resulting in infinite loop.
    - #1245: Optimizer: Dead branch elimination: Avoid a null pointer dereference.
    - #1250: Optimizer: Dead branch elimination: Avoid spuriously reporting a change.
@@ -1185,7 +1185,7 @@ v2017.2 2017-12-15
    - Support OpenCL 1.2, 2.0 target environments, including embedded profiles
    - Add CONTRIBUTING.md
    - Fix exit status code for spirv-link
-   - Disassember: Enable emitting ANSI colour codes to a string
+   - Disassmbler: Enable emitting ANSI colour codes to a string
    - Library avoids polluting global namespace.  The libraries can export C and C++
      symbols starting with "spv", or in a C++ namespace.  Add a test for this.
    - Linux release builds include debug information, for easier profiling
@@ -1417,7 +1417,7 @@ v2016.3 2016-08-24
    as a GraphiViz "dot" graph
  - Add optimization pass: Eliminate dead constants.
  - Add spirv-lesspipe.sh filter utility
- - Fixes issues:
+ - Fixes bugs:
    #288: Check def-use dominance rules for OpPhi (variable,parent) operands
    #339: Allow OpUndef in types-constants-global-vars section, as required
      by SPIR-V 1.0 Rev7, 1.1 Rev 3.