[SYCL] Disable fallback assert by default

[s-kanaev]

Due excessive amount of issues submitted against fallback assert implementation the fallback assert is now disabled by default until fixed.

[s-kanaev]

Regressions fixed in intel/llvm-test-suite#498

[bader]

@s-kanaev, please, fill the description. I miss the context - why do we need this change?

[rbegam]

LGTM

[bader]

@s-kanaev, please, fill the description. I miss the context - why do we need this change?

Ping.
Please, resolve merge conflicts.

[s-kanaev]

Ping.
Please, resolve merge conflicts.

Done

[bader]

Suggested change

	#if defined(SYCL_ENABLE_FALLBACK_ASSERT) && !defined(__NVPTX__)
	#define __SYCL_USE_FALLBACK_ASSERT 1
	#if defined(SYCL_ENABLE_FALLBACK_ASSERT)
	#if defined(__NVPTX__)
	#warning "Fallback assert is not supported on NVPTX target"
	#define __SYCL_USE_FALLBACK_ASSERT 0
	#else
	#define __SYCL_USE_FALLBACK_ASSERT 1
	#endif

Defining this macro enables the fallback assert feature even on devices without native support.

I suggest we add a note to the documentation that fallback assert is not supported on CUDA back-end.
BTW, is it supported on HIP?

[s-kanaev]

@pvchupin , @gmlueck , do you have any objections to the patch?

[s-kanaev]

/verify with intel/llvm-test-suite#754

[gmlueck]

I think the documentation needs some tweaks.

[s-kanaev]

/verify with intel/llvm-test-suite#754

[bader]

@s-kanaev, please, fix pre-commit fails.

[s-kanaev]

/verify with intel/llvm-test-suite#754

[bader]

Please, fix failures in pre-commit.

Failed Tests (9):
  SYCL :: Assert/assert_in_kernels.cpp
  SYCL :: Assert/assert_in_multiple_tus.cpp
  SYCL :: Assert/assert_in_multiple_tus_one_ndebug.cpp
  SYCL :: Assert/assert_in_one_kernel.cpp
  SYCL :: Assert/assert_in_simultaneous_kernels.cpp
  SYCL :: Assert/assert_in_simultaneously_multiple_tus.cpp
  SYCL :: Assert/assert_in_simultaneously_multiple_tus_one_ndebug.cpp
  SYCL :: DeviceLib/assert-aot.cpp
  SYCL :: DeviceLib/assert.cpp

[s-kanaev]

Failed Tests (9):

These are resolved in intel/llvm-test-suite#754
See result in Jenkins/llvm-test-suite.