Unit test cases for XE LOAD and STORE

[rishi-yadav]

API Function	Template Signature	Function
XE_LOAD_2D	<Bits, Height, Width>	High-speed 2D block loading
XE_STORE_2D	<Bits, Height, Width>	Efficient 2D block storage

11 test cases added for diff datatypes with 7 variations of height so total 77 variations used in this PR

[rishi-yadav]

With IGC >= 2.18

[----------] Global test environment tear-down
[==========] 71 tests from 4 test suites ran. (6890 ms total)
[  PASSED  ] 71 tests.

with IGC = 2.11
 TEMPORARY: Force lower version for testing
set(IGC_VER "2.11")  # Change this to test different versions

[----------] Global test environment tear-down
[==========] 42 tests from 4 test suites ran. (3453 ms total)
[  PASSED  ] 40 tests.
[  SKIPPED ] 2 tests, listed below:
[  SKIPPED ] PVC_CuTe_Xe.MMA_DPAS_SKIPPED
[  SKIPPED ] PVC_CuTe_Xe.XE_COPY_2D_SKIPPED

[Copilot]

Pull Request Overview

This PR adds comprehensive unit tests for Intel XE architecture's 2D block copy operations, specifically testing the XE_LOAD_2D and XE_STORE_2D template functions. The tests validate functionality across multiple data types and block dimensions.

• Added 84 test cases covering various data types (uint8_t, int8_t, uint16_t, int16_t, half_t, bfloat16_t, uint32_t, int32_t, float, tfloat32_t, char) with different height configurations (2-8 rows)
• Implemented device kernel that performs load-to-register followed by store-to-memory operations to verify round-trip data integrity
• Added fallback test cases for environments with insufficient IGC compiler version support

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
test/unit/cute/intel_xe/xe_copy_2d_test.cpp	New comprehensive test suite for XE_LOAD_2D and XE_STORE_2D operations with 84 test cases across multiple data types
test/unit/cute/intel_xe/mma.cpp	Added fallback test case for environments lacking IGC 2.18+ support
test/unit/cute/intel_xe/CMakeLists.txt	Integrated new test file into build system

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