TableGen: Fixed the string table definitions visibility. (#148946)

This fixes the buildbots issues reported in #148839.

Author: vzakhari

llvm/lib/TableGen/StringToOffsetTable.cpp

@@ -83,10 +83,11 @@ void StringToOffsetTable::EmitStringTableDef(raw_ostream &OS,
 #pragma GCC diagnostic pop
 #endif
 
-{1}constexpr llvm::StringTable
+{1} llvm::StringTable
 {2}{0} = {0}Storage;
 )",
-                Name, ClassPrefix.empty() ? "static " : "", ClassPrefix);
+                Name, ClassPrefix.empty() ? "static constexpr" : "const",
+                ClassPrefix);
 }
 
 void StringToOffsetTable::EmitString(raw_ostream &O) const {

llvm/test/TableGen/RuntimeLibcallEmitter.td

@@ -135,7 +135,7 @@ def BlahLibrary : SystemRuntimeLibrary<isBlahArch, (add calloc, LibraryWithCondi
 // CHECK-NEXT: #pragma GCC diagnostic pop
 // CHECK-NEXT: #endif
 // CHECK-EMPTY:
-// CHECK-NEXT: constexpr llvm::StringTable
+// CHECK-NEXT: const llvm::StringTable
 // CHECK-NEXT: RTLIB::RuntimeLibcallsInfo::RuntimeLibcallImplNameTable = RuntimeLibcallImplNameTableStorage;
 // CHECK-EMPTY:
 // CHECK-NEXT: const uint16_t RTLIB::RuntimeLibcallsInfo::RuntimeLibcallNameOffsetTable[] = {