[llvm] [TableGen][CodeGen] Remove DisableEncoding field of Instruction class (PR #156098)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-darwin` running on `doug-worker-3` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/23/builds/13447

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM-Unit :: Support/./SupportTests/3/13' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/unittests/Support/./SupportTests-LLVM-Unit-91172-3-13.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=13 GTEST_SHARD_INDEX=3 /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/unittests/Support/./SupportTests
--

Note: This is test shard 4 of 13.
[==========] Running 119 tests from 78 test suites.
[----------] Global test environment set-up.
[----------] 1 test from DataExtractorDeathTest
[ RUN      ] DataExtractorDeathTest.Cursor
[       OK ] DataExtractorDeathTest.Cursor (295 ms)
[----------] 1 test from DataExtractorDeathTest (295 ms total)

[----------] 1 test from AlignmentTest
[ RUN      ] AlignmentTest.Division
[       OK ] AlignmentTest.Division (0 ms)
[----------] 1 test from AlignmentTest (0 ms total)

[----------] 1 test from AllocatorTest
[ RUN      ] AllocatorTest.TestAlignment
[       OK ] AllocatorTest.TestAlignment (0 ms)
[----------] 1 test from AllocatorTest (0 ms total)

[----------] 1 test from ThumbISABuildAttr
[ RUN      ] ThumbISABuildAttr.testBuildAttr
[       OK ] ThumbISABuildAttr.testBuildAttr (0 ms)
[----------] 1 test from ThumbISABuildAttr (0 ms total)

[----------] 1 test from PCS_RWBuildAttr
[ RUN      ] PCS_RWBuildAttr.testBuildAttr
[       OK ] PCS_RWBuildAttr.testBuildAttr (0 ms)
[----------] 1 test from PCS_RWBuildAttr (0 ms total)

[----------] 1 test from HardFPBuildAttr
[ RUN      ] HardFPBuildAttr.testBuildAttr
[       OK ] HardFPBuildAttr.testBuildAttr (0 ms)
[----------] 1 test from HardFPBuildAttr (0 ms total)

[----------] 2 tests from BinaryStreamTest
[ RUN      ] BinaryStreamTest.FixedStreamArray
[       OK ] BinaryStreamTest.FixedStreamArray (0 ms)
[ RUN      ] BinaryStreamTest.StreamWriterStrings
[       OK ] BinaryStreamTest.StreamWriterStrings (0 ms)
[----------] 2 tests from BinaryStreamTest (0 ms total)

[----------] 1 test from BlockFrequencyTest
[ RUN      ] BlockFrequencyTest.Saturate
[       OK ] BlockFrequencyTest.Saturate (0 ms)
[----------] 1 test from BlockFrequencyTest (0 ms total)
...

```

</details>

https://github.com/llvm/llvm-project/pull/156098