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Fixes issue #6898
The -emit-spirv-via-glsl slang-test option has been broken for
some amount of time. Tests that were using it were operating as
if using -emit-spirv-directly, leading to many duplicated tests.
After fixing the test option, there were an number of errors that
appeared as a result.
This change fixes the broken test option and the resulting test
errors. Some of the test errors revealed some legitimate issues,
such as:
-The GLSL bitCount instrinsic only supports 32-bit integers and
requires emulation for other bit widths.
-Emitting GLSL 8-bit and 16-bit glsl integer types did not emit
the proper extension requirements
-Emitting GLSL and casting for 16-bit integers was missing a
closing parenthesis.
-Missing profile for GL_EXT_shader_explicit_arithmetic_types
-Missing toType cases for UInt8/Int8 for the kIROp_BitCast case
in tryEmitInstExprImpl.
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Change adds 16-bit and 8-bit support for countbits intrinsic. In
cases where a backend's native counbits lacks support, support
is emulated.
New tests are added for 16-bit and 8-bit support. Additional testing
added for 32-bit and minor updates made to 64-bit countbits.
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* Extend `countbits` intrinsic for vector types
This commit implements the overloading function for `countbits` function.
Because HLSL has following overloadings,
```
uint count_bits(uint value);
uint2 count_bits(uint2 value);
uint3 count_bits(uint3 value);
uint4 count_bits(uint4 value);
```
https://learn.microsoft.com/en-us/windows/win32/direct3dhlsl/countbits
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