Apply constexpr on global constant varaibles

When HIP_ENABLE_DEFERRED_LOADING=0, many global variables will be
referenced but they are not initialized in that early time. The patch
will use constexpr to initialze global constant varables in compile
time.

Change-Id: I9d538b7abc6a0ce700ec3332b97fc144db5fc1ef


[ROCm/clr commit: fdef6f722f]

projects/clr/rocclr/device/devkernel.cpp

@@ -37,7 +37,7 @@
 namespace device {
 
 // ================================================================================================
-static const clk_value_type_t ClkValueMapType[6][6] = {
+static constexpr clk_value_type_t ClkValueMapType[6][6] = {
     {T_CHAR, T_CHAR2, T_CHAR3, T_CHAR4, T_CHAR8, T_CHAR16},
     {T_SHORT, T_SHORT2, T_SHORT3, T_SHORT4, T_SHORT8, T_SHORT16},
     {T_INT, T_INT2, T_INT3, T_INT4, T_INT8, T_INT16},
@@ -465,7 +465,6 @@ static amd_comgr_status_t populateKernelMetaV3(const amd_comgr_metadata_node_t k
   amd_comgr_metadata_kind_t kind;
   size_t size = 0;
   std::string buf;
-
   // get the key of the argument field
   status = amd::Comgr::get_metadata_kind(key, &kind);
   if (kind == AMD_COMGR_METADATA_KIND_STRING && status == AMD_COMGR_STATUS_SUCCESS) {