[llvm] [InstrRef][nfc] Remove usage of unique_ptrs of arrays (PR #74203)

[Felipe de Azevedo Piovezan via llvm-commits]

================
@@ -205,11 +205,11 @@ namespace LiveDebugValues {
 using namespace llvm;
 
 /// Type for a table of values in a block.
-using ValueTable = std::unique_ptr<ValueIDNum[]>;
+using ValueTable = SmallVector<ValueIDNum, 0>;
 
 /// Type for a table-of-table-of-values, i.e., the collection of either
 /// live-in or live-out values for each block in the function.
-using FuncValueTable = std::unique_ptr<ValueTable[]>;
+using FuncValueTable = SmallVector<ValueTable, 0>;
----------------
felipepiovezan wrote:

I agree.
@jmorse would you be ok if I removed the `FuncValueTable` typedef and only kept `ValueTable`?

https://github.com/llvm/llvm-project/pull/74203