[SYCL][Driver] Update -fsycl-dump-device-code option name.

[srividya-sundaram]

This PR deprecates the usage of -fsycl-dump-device-code option, making this option backend-agnostic, extending its functionality beyond just SYCL to include OpenMP and other offloading models in the future, with the new option name: -save-offload-code=/path/to/offload/code/(Linux) and -(or)/Qsave-offload-code=/path/to/offload/code/ (Windows)

A diagnostic warning is emitted when -fsycl-dump-device-code option is passed to the Clang driver.
Example:

clang++ -fsycl -fsycl-dump-device-code= syclfile.cpp
clang++: warning: option '-fsycl-dump-device-code=' is deprecated and will be removed in a future release, use '-save-offload-code=' instead [-Wdeprecated]

[mdtoguchi]

Just some small items. Should we add this option to the UsersManual.md file as well?

[mdtoguchi]

OK for driver - just a comment on the doc update.

[asudarsa]

Changes look good. However, I do feel that the option can just be renamed as '-dump-device-code'. I do not have a strong objection. But, I am curious why '-save-offload-code' was preferred here.

[srividya-sundaram]

Ping @intel/dpcpp-doc-reviewers

[bader]

Let's align user documentation with the help message and fix formatting.

Suggested change

	**`-fsycl-dump-device-code=/path/to/device/object/file`** [DEPRECATED]
	Enable dumping of device object files(SPIR-V and PTX files) during SYCL
	offload compilation.
	This option is replaced with -save-offload-code.
	NOTE: This flag is currently only supported in
	SYCL offloading to the CUDA and SPIR-V targets.
	**`-save-offload-code=/path/to/device/object/file`**
	Enable saving of device object files during an offload compilation.
	NOTE: This flag is currently only supported in
	SYCL offloading to the CUDA and SPIR-V targets.
	**`-fsycl-dump-device-code=<path-to-device-build-artifacts-directory>`** [DEPRECATED]
	Enable dumping of device object files (SPIR-V and PTX files) during SYCL
	offload compilation.
	This option is replaced with -save-offload-code.
	NOTE: This flag is currently only supported in SYCL offloading to the CUDA
	and SPIR-V targets.
	**`-save-offload-code=<path-to-device-build-artifacts-directory>`**
	Save offload code generated during compilation into the user provided
	directory.
	NOTE: This flag is currently only supported in SYCL offloading to the CUDA
	and SPIR-V targets.