vkDestroyShaderModule

To destroy a shader module, call:

void vkDestroyShaderModule(
    VkDevice device,
    VkShaderModule shaderModule,
    const VkAllocationCallbacks* pAllocator);

device is the logical device that destroys the shader module.
shaderModule is the handle of the shader module to destroy.
pAllocator controls host memory allocation as described in the Memory Allocation chapter.

A shader module can be destroyed while pipelines created using its shaders are still in use.

If VkAllocationCallbacks were provided when shaderModule was created, a compatible set of callbacks must be provided here

If no VkAllocationCallbacks were provided when shaderModule was created, pAllocator must be NULL

device must be a valid VkDevice handle

If shaderModule is not VK_NULL_HANDLE, shaderModule must be a valid VkShaderModule handle

If pAllocator is not NULL, pAllocator must be a valid pointer to a valid VkAllocationCallbacks structure

If shaderModule is a valid handle, it must have been created, allocated, or retrieved from device