[llvm] [GISel] Add more FP opcodes to CSE (PR #123624)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-x86_64-debian-fast` running on `gribozavr4` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/56/builds/16857

<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)
...
5.290 [2/10/1210] Linking CXX executable unittests/CodeGen/CodeGenTests
5.317 [2/9/1211] Linking CXX executable unittests/DebugInfo/DWARF/DebugInfoDWARFTests
5.361 [2/8/1212] Linking CXX executable unittests/DebugInfo/LogicalView/DebugInfoLogicalViewTests
5.524 [2/7/1213] Linking CXX executable tools/clang/unittests/Driver/ClangDriverTests
6.340 [2/6/1214] Linking CXX executable tools/clang/unittests/Frontend/FrontendTests
6.750 [2/5/1215] Linking CXX executable tools/clang/unittests/Tooling/ToolingTests
6.778 [2/4/1216] Linking CXX executable tools/clang/unittests/Interpreter/ExceptionTests/ClangReplInterpreterExceptionTests
7.751 [2/3/1217] Linking CXX executable tools/clang/tools/extra/clangd/unittests/ClangdTests
8.160 [2/2/1218] Linking CXX executable tools/clang/unittests/Interpreter/ClangReplInterpreterTests
8.476 [2/1/1219] Building CXX object unittests/CodeGen/GlobalISel/CMakeFiles/GlobalISelTests.dir/CSETest.cpp.o
FAILED: unittests/CodeGen/GlobalISel/CMakeFiles/GlobalISelTests.dir/CSETest.cpp.o 
CCACHE_CPP2=yes CCACHE_HASHDIR=yes /usr/bin/ccache /usr/bin/clang++ -DGTEST_HAS_RTTI=0 -DLLVM_BUILD_STATIC -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/b/1/clang-x86_64-debian-fast/llvm.obj/unittests/CodeGen/GlobalISel -I/b/1/clang-x86_64-debian-fast/llvm.src/llvm/unittests/CodeGen/GlobalISel -I/b/1/clang-x86_64-debian-fast/llvm.obj/include -I/b/1/clang-x86_64-debian-fast/llvm.src/llvm/include -I/b/1/clang-x86_64-debian-fast/llvm.src/third-party/unittest/googletest/include -I/b/1/clang-x86_64-debian-fast/llvm.src/third-party/unittest/googlemock/include -std=c++11 -Wdocumentation -Wno-documentation-deprecated-sync -fPIC -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG  -Wno-variadic-macros -Wno-gnu-zero-variadic-macro-arguments -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -Wno-suggest-override -std=c++17 -MD -MT unittests/CodeGen/GlobalISel/CMakeFiles/GlobalISelTests.dir/CSETest.cpp.o -MF unittests/CodeGen/GlobalISel/CMakeFiles/GlobalISelTests.dir/CSETest.cpp.o.d -o unittests/CodeGen/GlobalISel/CMakeFiles/GlobalISelTests.dir/CSETest.cpp.o -c /b/1/clang-x86_64-debian-fast/llvm.src/llvm/unittests/CodeGen/GlobalISel/CSETest.cpp
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/unittests/CodeGen/GlobalISel/CSETest.cpp:9:
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/unittests/CodeGen/GlobalISel/GISelMITest.h:12:
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h:25:
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h:20:
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/CodeGen/TargetLowering.h:35:
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/CodeGen/SelectionDAG.h:31:
/b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/CodeGen/SelectionDAGNodes.h:2223:10: warning: HTML start tag prematurely ended, expected attribute name or '>' [-Wdocumentation]
  /// "<a, a+n, a+2n, a+3n, ...>" where a is integer and n is a non-zero integer,
         ^
/b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/CodeGen/SelectionDAGNodes.h:2224:20: warning: HTML start tag prematurely ended, expected attribute name or '>' [-Wdocumentation]
  /// the value "<a,n>" is returned.
                   ^
/b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/CodeGen/SelectionDAGNodes.h:2224:19: warning: HTML tag 'a' requires an end tag [-Wdocumentation-html]
  /// the value "<a,n>" is returned.
                  ^
/b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/CodeGen/SelectionDAGNodes.h:2223:9: warning: HTML tag 'a' requires an end tag [-Wdocumentation-html]
  /// "<a, a+n, a+2n, a+3n, ...>" where a is integer and n is a non-zero integer,
        ^
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/unittests/CodeGen/GlobalISel/CSETest.cpp:9:
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/unittests/CodeGen/GlobalISel/GISelMITest.h:12:
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h:25:
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h:20:
/b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/CodeGen/TargetLowering.h:5314:14: warning: parameter 'N' not found in the function declaration [-Wdocumentation]
  /// \param N Node to expand
             ^
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/unittests/CodeGen/GlobalISel/CSETest.cpp:9:
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/unittests/CodeGen/GlobalISel/GISelMITest.h:26:
/b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/MC/TargetRegistry.h:85:12: warning: parameter 'ShowInst' not found in the function declaration [-Wdocumentation]
/// \param ShowInst - Whether to show the MCInst representation inline with
           ^~~~~~~~
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/unittests/CodeGen/GlobalISel/CSETest.cpp:9:
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/unittests/CodeGen/GlobalISel/GISelMITest.h:29:
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/Target/TargetMachine.h:19:
In file included from /b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/MC/MCStreamer.h:30:
/b/1/clang-x86_64-debian-fast/llvm.src/llvm/include/llvm/TargetParser/ARMTargetParser.h:267:12: warning: parameter 'Arch' not found in the function declaration [-Wdocumentation]
/// \param Arch the architecture name (e.g., "armv7s"). If it is an empty
           ^~~~

```

</details>

https://github.com/llvm/llvm-project/pull/123624