This relands #167348.

The original PR was reverted due to a reported build failure, which was
later diagnosed as a local issue in the developer’s checkout or build
state. See discussion here:
https://github.com/llvm/llvm-project/pull/163659#discussion_r2511546964

No additional changes have been made in this reland.

Reverts #163659 due to missing one reference clang/Driver/Options.h in 
clang/include/clang/Driver/Driver.h.

See https://github.com/llvm/llvm-project/pull/163659#issuecomment-3512979187

This change moves option-related code from clangDriver into a new
clangOptions library.

This refactoring is part of a broader effort to support driver-managed
builds for compilations using C++ named modules and/or Clang modules.
It is required for linking the dependency scanning tooling against the
driver without introducing cyclic dependencies, which would otherwise
cause build failures when dynamic linking is enabled.
In particular, clangFrontend must no longer depend on clangDriver
for this to be possible.

This PR is motivated by the following review comment:
https://github.com/llvm/llvm-project/pull/152770#discussion_r2430756918

This PR inlines the static `InputsOk` function in clang
`Compilation.cpp` driver, because it was just a simple function call and
was called only once. In addition, inlining it allows removing the
double negation.

Introduces the SYCL based toolchain and initial toolchain construction
when using the '-fsycl' option. This option will enable SYCL based
offloading, creating a SPIR-V based IR file packaged into the compiled
host object.

This includes early support for creating the host/device object using
the new offloading model. The device object is created using the
spir64-unknown-unknown target triple.

New/Updated Options:
 -fsycl  Enables SYCL offloading for host and device
 -fsycl-device-only
         Enables device only compilation for SYCL
 -fsycl-host-only
         Enables host only compilation for SYCL

RFC Reference:
https://discourse.llvm.org/t/rfc-sycl-driver-enhancements/74092

This is a reland of: https://github.com/llvm/llvm-project/pull/107493

Identified with misc-include-cleaner.

Reverts llvm/llvm-project#107493

Failing bots include:
https://lab.llvm.org/buildbot/#/builders/190/builds/9546
https://lab.llvm.org/buildbot/#/builders/46/builds/7938

Introduces the SYCL based toolchain and initial toolchain construction
when using the '-fsycl' option. This option will enable SYCL based
offloading, creating a SPIR-V based IR file packaged into the compiled
host object.

This includes early support for creating the host/device object using
the new offloading model. The device object is created using the
spir64-unknown-unknown target triple.

New/Updated Options:
 -fsycl  Enables SYCL offloading for host and device
 -fsycl-device-only
         Enables device only compilation for SYCL
 -fsycl-host-only
         Enables host only compilation for SYCL

RFC Reference:
https://discourse.llvm.org/t/rfc-sycl-driver-enhancements/74092

Reverts llvm/llvm-project#109165

This created a buildbot failure on
[Fuchsia](https://lab.llvm.org/buildbot/#/builders/11/builds/8080).

The -time option prints timing information for the subcommands
(compiler, linker) in a format similar to that used by gcc/gfortran.

This partially addresses requests from #89888