Update verifier message

Author: amd-eochoalo

mlir/lib/Dialect/AMDGPU/IR/AMDGPUDialect.cpp

@@ -374,8 +374,8 @@ LogicalResult ScaledExtPacked816Op::verify() {
       bool is_valid = ((firstScaleLane == 0) && (firstScaleByte == 0)) ||
                       ((firstScaleLane == 1) && (firstScaleByte == 2));
       if (!is_valid) {
-        return emitOpError(
-            "blockSize of 16 can only have firstScaleByte be 0 or 2 for f8.");
+        return emitOpError("blockSize of 16 can only have (firstScaleLane, "
+                           "firstScaleByte) be (0, 0) or (1, 2) for f8.");
       }
     }
   }

mlir/test/Conversion/AMDGPUToROCDL/cvt_scale_pk-gfx1250.mlir

@@ -134,7 +134,7 @@ func.func @amdgpu.scaled_ext_packed816_invalid_block_size_and_first_scale_byte_3
 // -----
 
 func.func @amdgpu.scaled_ext_packed816_invalid_attributes_for_f8(%v: vector<8xf8E5M2>, %scale: vector<4xf8E8M0FNU>) {
-  // expected-error@+1 {{'amdgpu.scaled_ext_packed816' op blockSize of 16 can only have firstScaleByte be 0 or 2 for f8.}}
+  // expected-error@+1 {{'amdgpu.scaled_ext_packed816' op blockSize of 16 can only have (firstScaleLane, firstScaleByte) be (0, 0) or (1, 2) for f8.}}
   %ret0 = amdgpu.scaled_ext_packed816 %v scale(%scale) blockSize(16) firstScaleLane(0) firstScaleByte(1) : vector<8xf8E5M2>, vector<4xf8E8M0FNU> -> vector<8xf16>
   func.return
 }