Default to KHR extension

Don't check precision qualifiers on cross-stage checks

Fix #2530.

Fixes #2586

Add cmd_bat action to bazel export_spirv_headers target

Fixed OpGroupNonUniformQuadBroadcast Direction operand being marked as a literal

Only having `cmd` rather than separate `cmd_bash` and `cmd_bat` (or
`cmd_ps`) requires bash to be installed on Windows. So adding support
for `cmd_bat` makes glslangValidator easier to compile on Windows.

Partial fix for inconsistencies re: #2578

gl_SecondaryPositionNV and gl_PositionPerViewNV are inconsistently
declared inside and outside of gl_PerVertex. This breaks interface block
matching. For now ignore these errors since it should be fixed with how
they are declared.

Fix issue with remapping global uniform blocks

fix typo for u64vec2/3/4 type define value

Avoid adding global uniform blocks to stages that don't already have it.
Otherwise multiple stages point to the same block object, and a
remapping that occurs later on will change the mapping on multiple
stages.

fix variable capitalization. Don't initialize it in the struct's constructor

Revert "Revert "GL_ext_vulkan_glsl_relaxed extension support, and cross stage aware IO mapper""

1. fix macro definition value for unsinged-int64-vector, according to kronos spec at https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_gpu_shader_int64.txt; 2. fix typo in reflection

Revert "GL_ext_vulkan_glsl_relaxed extension support, and cross stage aware IO mapper"

Pass correct proxy type for atomicStore

GL_ext_vulkan_glsl_relaxed extension support, and cross stage aware IO mapper

Fixes #2564

SPV: The capability string for RayTracingProvisionalKHR is missing

Add it to GLSLang disassembler.

Allow DepthUnchanged and DepthReplaced Modes in same SPIR-V module.

Fixes #2555

Allow grad texture ops in all shaders

Fixes #2551

Fix off-by-1 bug in gl_MaxCombinedTextureImageUnits check

Returned using find_host_package for PythonInterp 3 instead of find_pachage.

SPV: Change the key of extBuiltinMap to std::string

The problem was only with arrays of samplers.

Fixed #2552

Fix precision propagation around shifts

Fixes #2541

I changed this logic here: https://github.com/KhronosGroup/glslang/pull/2526/commits/05798c17fb17d339d66e064a407e75ceae4c0316
It was originally fixed here: https://github.com/KhronosGroup/glslang/commit/967fa92d14acea305267574faf63ebe753de98c4

Using const char* is not a good choice. We assume strings are always
from spv::E_SPV_XXX definitions. However, it is not the case. We can
store the name strings of extended intruction set in local variables.

Replace log2 and exp2 math func.