[LLD] [ELF] Add support for linker script unary plus operator (#121508)

This commit adds support for linker script unary plus ('+') operator. It
is helpful for improving compatibility between LLD a

[LLD] [ELF] Add support for linker script unary plus operator (#121508)

This commit adds support for linker script unary plus ('+') operator. It
is helpful for improving compatibility between LLD and GNU LD.

Closes #118047

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[ELF] Replace functions bAlloc/saver/uniqueSaver with member access

[ELF] Pass ctx to bAlloc/saver/uniqueSaver

[ELF] Migrate away from global ctx

[ELF] Replace errorCount with errCount(ctx)

to reduce reliance on the global context.

[ELF] Replace errorOrWarn(...) with Err

[ELF] Replace warn(...) with Warn

[ELF] Replace error(...) with ErrAlways or Err

Most are migrated to ErrAlways mechanically.
In the future we should change most to Err.

[ELF] Move static nextGroupId isInGroup to LinkerDriver

[ELF] Pass Ctx & to InputFiles

[ELF] Pass Ctx & to OutputSections

[ELF] Move elf::symtab into Ctx

Remove the global variable `symtab` and add a member variable
(`std::unique_ptr<SymbolTable>`) to `Ctx` instead.

This is one step toward eliminating global states.

[ELF] Move elf::symtab into Ctx

Remove the global variable `symtab` and add a member variable
(`std::unique_ptr<SymbolTable>`) to `Ctx` instead.

This is one step toward eliminating global states.

Pull Request: https://github.com/llvm/llvm-project/pull/109612

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[ELF] ScriptParser: make Ctx & a member variable. NFC

Lambda captures need adjusting.

[ELF] ScriptParser: pass Ctx to ScriptParser and ScriptLexer. NFC

[ELF] Move target to Ctx. NFC

Ctx was introduced in March 2022 as a more suitable place for such
singletons.

Follow-up to driver (2022-10) and script (2024-08).

[ELF] Move script into Ctx. NFC

Ctx was introduced in March 2022 as a more suitable place for such
singletons.

We now use default-initialization for `LinkerScript` and should pay
attention to non-c

[ELF] Move script into Ctx. NFC

Ctx was introduced in March 2022 as a more suitable place for such
singletons.

We now use default-initialization for `LinkerScript` and should pay
attention to non-class types (e.g. `dot` is initialized by commit
503907dc505db1e439e7061113bf84dd105f2e35).

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[LLD] Add CLASS syntax to SECTIONS (#95323)

This allows the input section matching algorithm to be separated from
output section descriptions. This allows a group of sections to be
assigned to mul

[LLD] Add CLASS syntax to SECTIONS (#95323)

This allows the input section matching algorithm to be separated from
output section descriptions. This allows a group of sections to be
assigned to multiple output sections, providing an explicit version of
--enable-non-contiguous-regions's spilling that doesn't require altering
global linker script matching behavior with a flag. It also makes the
linker script language more expressive even if spilling is not intended,
since input section matching can be done in a different order than
sections are placed in an output section.

The implementation reuses the backend mechanism provided by
--enable-non-contiguous-regions, so it has roughly similar semantics and
limitations. In particular, sections cannot be spilled into or out of
INSERT, OVERWRITE_SECTIONS, or /DISCARD/. The former two aren't
intrinsic, so it may be possible to relax those restrictions later.

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[ELF] --defsym: support quoted LHS

and move = splitting from Driver.cpp to ScriptParser.cpp.

[ELF] Respect --sysroot for INCLUDE

If an included script is under the sysroot directory, when it opens an
absolute path file (`INPUT` or `GROUP`), add sysroot before the absolute
path. When the inc

[ELF] Respect --sysroot for INCLUDE

If an included script is under the sysroot directory, when it opens an
absolute path file (`INPUT` or `GROUP`), add sysroot before the absolute
path. When the included script ends, the `isUnderSysroot` state is
restored.

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[ELF] Output section phdr: support quoted names

[ELF] INSERT [AFTER|BEFORE]: support quoted names

[ELF] Fix INCLUDE cycle detection

Fix #93947: the cycle detection mechanism added by
https://reviews.llvm.org/D37524 also disallowed including a file twice,
which is an unnecessary limitation.

Now

[ELF] Fix INCLUDE cycle detection

Fix #93947: the cycle detection mechanism added by
https://reviews.llvm.org/D37524 also disallowed including a file twice,
which is an unnecessary limitation.

Now that we have an include stack #100493, supporting multiple inclusion
is trivial. Note: a filename can be referenced with many different
paths, e.g. a.lds, ./a.lds, ././a.lds. We don't attempt to detect the
cycle in the earliest point.

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[ELF] OUTPUT_ARCH: report unclosed error

[ELF] Replace unquote(next()) with readName. NFC

[ELF] Memory region: support quoted names