Update code object V3 kernarg queries

Code object V2 had the ability to support the following queries:

- HSA_CODE_SYMBOL_INFO_KERNEL_KERNARG_SEGMENT_SIZE
- HSA_EXECUTABLE_SYMBOL_INFO_KERNEL_KERNARG_SEGMENT_SIZE
- HSA_CODE_SYMBOL_INFO_KERNEL_KERNARG_SEGMENT_ALIGNMENT
- HSA_EXECUTABLE_SYMBOL_INFO_KERNEL_KERNARG_SEGMENT_ALIGNMENT

However code object V3 onwards cannot support these as the kernel
descriptor changed. These queries need to be deprecated.

Until then return more reasonable values:

- For kernarg alignment return 16 which is the minimum alignment
  required by the HSA standard.

- For kernarg size return the field from the kernel descriptor which
  is a hint. If it is 0 then the compiler is not specifying the kernarg
  size, or the kernel has no kernarg.

Change-Id: I19ce6cd0f3658a2bf62277492f39100ea5ab4256


[ROCm/ROCR-Runtime commit: ef755e4c82]

projects/rocr-runtime/runtime/hsa-runtime/loader/executable.cpp

@@ -1422,8 +1422,8 @@ hsa_status_t ExecutableImpl::LoadDefinitionSymbol(hsa_agent_t agent,
     llvm::amdhsa::kernel_descriptor_t kd;
     sym->GetSection()->getData(sym->SectionOffset(), &kd, sizeof(kd));
 
-    uint32_t kernarg_segment_size = 0;      // FIXME.
-    uint32_t kernarg_segment_alignment = 0; // FIXME.
+    uint32_t kernarg_segment_size = kd.kernarg_size; // FIXME: If 0 then the compiler is not specifying the size.
+    uint32_t kernarg_segment_alignment = 16;         // FIXME: Use the minumum HSA required alignment.
     uint32_t group_segment_size = kd.group_segment_fixed_size;
     uint32_t private_segment_size = kd.private_segment_fixed_size;
     bool is_dynamic_callstack = false;