Changes

Summary

[lib/Object] - Make ELFObjectFile::getSymbol() return Expected<>. (details)
[yaml2obj/obj2yaml] - Make Value/Size fields of Symbol optional. (details)
Revert "[LLDB] Remove AArch64/Linux xfail decorator from TestGuiBasicDebug" (details)
[X86][SSE] combineReductionToHorizontal - don't rely on widenSubVector to handle illegal vector types. (details)
Revert "Ensure SplitEdge to return the new block between the two given blocks" (details)

Commit 407d42002904ce541f732ce4300913ef57cff232 by grimar [lib/Object] - Make ELFObjectFile::getSymbol() return Expected<>. This was requested in comments for D93209: https://reviews.llvm.org/D93209#inline-871192 D93209 fixes an issue with `ELFFile<ELFT>::getEntry`, after what `getSymbol` starts calling `report_fatal_error` for previously missed invalid cases. This patch makes it return `Expected<>` and updates callers. For few of them I had to add new `report_fatal_error` calls. But I see no way to avoid it currently. The change would affects too many places, e.g: `getSymbolBinding` and other methods are used from `ELFSymbolRef` which is used in too many places across LLVM. Differential revision: https://reviews.llvm.org/D93297
	llvm/tools/llvm-objdump/llvm-objdump.cpp
	llvm/unittests/Object/ELFObjectFileTest.cpp
	llvm/tools/llvm-objdump/ELFDump.cpp
	llvm/include/llvm/Object/ELFObjectFile.h
Commit 8c2cf89834c3496be343525b9f9c6aecc9182117 by grimar [yaml2obj/obj2yaml] - Make Value/Size fields of Symbol optional. When a field is optional we can use the `=<none>` syntax in macros. This patch makes `Value`/`Size` fields of `Symbol` optional and adds test cases for them. Differential revision: https://reviews.llvm.org/D93010
	llvm/test/tools/yaml2obj/ELF/symbol-size.yaml
	llvm/lib/ObjectYAML/ELFYAML.cpp
	llvm/include/llvm/ObjectYAML/ELFYAML.h
	llvm/test/tools/obj2yaml/ELF/symbol.yaml
	llvm/test/tools/yaml2obj/ELF/symbol-value.yaml
	llvm/tools/obj2yaml/elf2yaml.cpp
	llvm/lib/ObjectYAML/ELFEmitter.cpp
Commit 9f80ab1213e9f28b1b86f133fa7edf9a61c6f8fd by omair.javaid Revert "[LLDB] Remove AArch64/Linux xfail decorator from TestGuiBasicDebug" This reverts commit 3d27a99b2ed24e1951483cf13357ec188ad44bb0.
	lldb/test/API/commands/gui/basicdebug/TestGuiBasicDebug.py
Commit e55f7de946b1be546b05ce7399ec4f8fc7980cf5 by llvm-dev [X86][SSE] combineReductionToHorizontal - don't rely on widenSubVector to handle illegal vector types. Thanks to @asbirlea for reporting the bug.
	llvm/test/CodeGen/X86/vector-reduce-mul.ll
	llvm/lib/Target/X86/X86ISelLowering.cpp
Commit c10757200d89e59a52ab8cbbc68178eeafaa3600 by whitneyt Revert "Ensure SplitEdge to return the new block between the two given blocks" This reverts commit cf638d793c489632bbcf0ee0fbf9d0f8c76e1f48.
	llvm/lib/IR/BasicBlock.cpp
	llvm/test/Transforms/LoopUnswitch/2011-11-18-SimpleSwitch.ll
	llvm/include/llvm/IR/BasicBlock.h
	llvm/test/CodeGen/AMDGPU/call-constexpr.ll
	llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
	llvm/include/llvm/Transforms/Utils/BasicBlockUtils.h
	llvm/unittests/Transforms/Utils/BasicBlockUtilsTest.cpp