Prepare release v2025.4 (KhronosGroup#6335)

Author: s-perron

CHANGES

@@ -1,5 +1,50 @@
 Revision history for SPIRV-Tools
 
+v2025.4 2025-09-22
+  - General
+    - Add support for SPV_INTEL_function_variants (#6211, #6195)
+    - Add support for SPV_ARM_graph (#6177)
+    - Add support for SPV_INTEL_inline_assembly (#6210)
+    - Add support for SPV_QCOM_cooperative_matrix_conversion (#6252)
+    - Add BFloat16 encoding support (#6222)
+    - Allow mimalloc in static builds (#6267)
+    - Allow processing of directories in spirv-val (#6292)
+  - Optimizer
+    - Handle ID overflow in many passes (#6310, #6325, #6302, #6309, #6306, #6305, #6304, #6299, #6301, #6312)
+    - Add support for OpTypeGraphARM and tensors to type manager (#6247, #6202)
+    - Add Geometry capability to the trim pass (#6278)
+    - Support CCP for 16bit integer min and max operations. (#6280, #6287)
+    - Fix ADCE DebugDeclare DebugValue treatment (#6179)
+    - Fix lerp and fmix folding with half types (#6293, #6297)
+    - Fix trimming pass with OpNop (#6314)
+    - Support OpSpecConstantCompositeReplicateEXT in FoldSpecConstantOpAndCompositePass (#6315)
+    - Fix OpUndef placement in ADCE (#6154)
+    - Add null checks for MakeSClampInst and GetValueForType (#6324)
+    - Fix crash if shader uses linkage decoration (#6191)
+  - Validator
+    - Update memory semantics rules to match the specification (#6096)
+    - Validate PhysicalStorageBuffer alignment (#6266)
+    - Validate DescriptorSet and Binding decorations for all relevant variables (#6242)
+    - Validate that OpDecorateId IDs are well-ordered (#6227)
+    - Add validation for SPV_QCOM_image_processing (#6268)
+    - Add validation for Patch Decoration (#6219)
+    - Add validation for PrimitiveID (#6209)
+    - Add Workgroup Size check for Compute Derivatives (#6294)
+    - Allow compare-exchange semantics equal=Release and unequal=Acquire (#6286)
+    - Accept graphs with no inputs and/or no body (#6291)
+    - Fix GetLargestScalarType with untyped PSB (#6327)
+    - Fix Mesh Builtin checking for signed int and multi-entrypoint shaders (#6238, #6313)
+    - Fix OpTensor{Read,Write}ARM for tensors with a spec constant rank (#6206)
+    - Accept NonReadable/NonWritable on tensor variables in UniformConstant (#6184)
+    - Fix location of DebugFunctionDefinition instruction (#6198)
+    - Print SPIR-V version info in error message (#6283)
+  - Assembler
+    - Fix docs: need '-' arg to specify stdin (#6194)
+  - Disassembler
+    - Fix missing color on result ID (#6272)
+  - Diff
+    - Add spirv-diff to list of install targets (#6258)
+
 v2025.3 2025-06-23
   - General
     - Add mimalloc to improve multithreaded performance (#6188)