Round up allocations to multiples of 32.

test/cmdlineTests/ir_compiler_subobjects/output

@@ -72,7 +72,7 @@ object "D_16" {
             function allocateMemory(size) -> memPtr
             {
                 memPtr := mload(64)
-                let newFreePtr := add(memPtr, size)
+                let newFreePtr := add(memPtr, and(add(size, 31), not(31)))
                 if or(gt(newFreePtr, 0xffffffffffffffff), lt(newFreePtr, memPtr)) { panic_error_0x41() }
                 mstore(64, newFreePtr)
             }