Add ScalarType 22 BITS16 support in etdump gen and deserialization (#6504)

Summary:

Add support in etdump gen and etdump parsing for ScalarType 22 `BITS16`. Here's where the type is defined: https://www.internalfb.com/code/fbsource/[64a8013e3ebfbbaa70c220fc90102683d3181ad8]/fbcode/executorch/runtime/core/portable_type/scalar_type.h?lines=85

Note: `fbcode/executorch/schema/scalar_type.fbs` and `fbcode/executorch/devtools/etdump/scalar_type.fbs` are copies of each other to get around some build issue and there's a script to make sure they're in sync.

Reviewed By: Gasoonjia

Differential Revision: D64812253

Author: Olivia-liu

devtools/etdump/etdump_flatcc.cpp

@@ -55,6 +55,8 @@ executorch_flatbuffer_ScalarType_enum_t get_flatbuffer_scalar_type(
       return executorch_flatbuffer_ScalarType_DOUBLE;
     case exec_aten::ScalarType::Bool:
       return executorch_flatbuffer_ScalarType_BOOL;
+    case exec_aten::ScalarType::Bits16:
+      return executorch_flatbuffer_ScalarType_BITS16;
     default:
       ET_CHECK_MSG(
           0,

devtools/etdump/scalar_type.fbs

@@ -24,9 +24,14 @@ enum ScalarType : byte {
   QINT32 = 14,
   QUINT4X2 = 16,
   QUINT2X4 = 17,
+  BITS16 = 22,
   // Types currently not implemented.
   // COMPLEXHALF = 8,
   // COMPLEXFLOAT = 9,
   // COMPLEXDOUBLE = 10,
   // BFLOAT16 = 15,
+  // BITS1x8 = 18,
+  // BITS2x4 = 19,
+  // BITS4x2 = 20,
+  // BITS8 = 21,
 }

exir/scalar_type.py

@@ -26,4 +26,4 @@ class ScalarType(IntEnum):
     BFLOAT16 = 15
     QUINT4x2 = 16
     QUINT2x4 = 17
-    Bits16 = 22
+    BITS16 = 22

exir/tensor.py

@@ -262,7 +262,7 @@ def memory_format_enum(memory_format: torch.memory_format) -> int:
     torch.qint32: ScalarType.QINT32,
     torch.bfloat16: ScalarType.BFLOAT16,
     torch.quint4x2: ScalarType.QUINT4x2,
-    torch.uint16: ScalarType.Bits16,
+    torch.uint16: ScalarType.BITS16,
 }
 
 

schema/scalar_type.fbs

@@ -24,9 +24,14 @@ enum ScalarType : byte {
   QINT32 = 14,
   QUINT4X2 = 16,
   QUINT2X4 = 17,
+  BITS16 = 22,
   // Types currently not implemented.
   // COMPLEXHALF = 8,
   // COMPLEXFLOAT = 9,
   // COMPLEXDOUBLE = 10,
   // BFLOAT16 = 15,
+  // BITS1x8 = 18,
+  // BITS2x4 = 19,
+  // BITS4x2 = 20,
+  // BITS8 = 21,
 }