[Backport to 15] Implement SPV_INTEL_subgroup_matrix_multiply_accumulate (#3003)

Spec:
https://github.khronos.org/SPIRV-Registry/extensions/INTEL/SPV_INTEL_subgroup_matrix_multiply_accumulate.html

Cherry-pick of
252b6d2

Author: YuriPlyakhin

include/LLVMSPIRVExtensions.inc

@@ -70,3 +70,4 @@ EXT(SPV_INTEL_cache_controls)
 EXT(SPV_INTEL_maximum_registers)
 EXT(SPV_INTEL_bindless_images)
 EXT(SPV_INTEL_2d_block_io)
+EXT(SPV_INTEL_subgroup_matrix_multiply_accumulate)

lib/SPIRV/libSPIRV/SPIRVInstruction.h

@@ -4000,5 +4000,23 @@ _SPIRV_OP(Subgroup2DBlockLoadTranspose, false, 11)
 _SPIRV_OP(Subgroup2DBlockLoadTransform, false, 11)
 #undef _SPIRV_OP
 
+class SPIRVSubgroupMatrixMultiplyAccumulateINTELInst
+    : public SPIRVInstTemplateBase {
+public:
+  llvm::Optional<ExtensionID> getRequiredExtension() const override {
+    return ExtensionID::SPV_INTEL_subgroup_matrix_multiply_accumulate;
+  }
+  SPIRVCapVec getRequiredCapability() const override {
+    return getVec(CapabilitySubgroupMatrixMultiplyAccumulateINTEL);
+  }
+};
+
+#define _SPIRV_OP(x, ...)                                                      \
+  typedef SPIRVInstTemplate<SPIRVSubgroupMatrixMultiplyAccumulateINTELInst,    \
+                            Op##x##INTEL, __VA_ARGS__>                         \
+      SPIRV##x##INTEL;
+_SPIRV_OP(SubgroupMatrixMultiplyAccumulate, true, 7, true, 4)
+#undef _SPIRV_OP
+
 } // namespace SPIRV
 #endif // SPIRV_LIBSPIRV_SPIRVINSTRUCTION_H

lib/SPIRV/libSPIRV/SPIRVNameMapEnum.h

@@ -612,6 +612,8 @@ template <> inline void SPIRVMap<Capability, std::string>::init() {
   add(CapabilitySubgroup2DBlockIOINTEL, "Subgroup2DBlockIOINTEL");
   add(CapabilitySubgroup2DBlockTransformINTEL, "Subgroup2DBlockTransformINTEL");
   add(CapabilitySubgroup2DBlockTransposeINTEL, "Subgroup2DBlockTransposeINTEL");
+  add(CapabilitySubgroupMatrixMultiplyAccumulateINTEL,
+      "SubgroupMatrixMultiplyAccumulateINTEL");
   // From spirv_internal.hpp
   add(internal::CapabilityFPGADSPControlINTEL, "FPGADSPControlINTEL");
   add(internal::CapabilityFastCompositeINTEL, "FastCompositeINTEL");

lib/SPIRV/libSPIRV/SPIRVOpCodeEnum.h

@@ -568,6 +568,7 @@ _SPIRV_OP(Subgroup2DBlockLoadTransformINTEL, 6232)
 _SPIRV_OP(Subgroup2DBlockLoadTransposeINTEL, 6233)
 _SPIRV_OP(Subgroup2DBlockPrefetchINTEL, 6234)
 _SPIRV_OP(Subgroup2DBlockStoreINTEL, 6235)
+_SPIRV_OP(SubgroupMatrixMultiplyAccumulateINTEL, 6237)
 _SPIRV_OP(GroupIMulKHR, 6401)
 _SPIRV_OP(GroupFMulKHR, 6402)
 _SPIRV_OP(GroupBitwiseAndKHR, 6403)