[spirv] Update instruction order in test.

tools/clang/test/CodeGenSPIRV/vk.layout.16bit-types.tbuffer.hlsl

@@ -9,10 +9,10 @@
 // CHECK: OpMemberDecorate %type_MyTBuffer 2 Offset 8
 // CHECK: OpMemberDecorate %type_MyTBuffer 2 MatrixStride 8
 // CHECK: OpMemberDecorate %type_MyTBuffer 2 RowMajor
-// CHECK: OpDecorate %type_MyTBuffer BufferBlock
 // CHECK: OpMemberDecorate %type_MyTBuffer 0 NonWritable
 // CHECK: OpMemberDecorate %type_MyTBuffer 1 NonWritable
 // CHECK: OpMemberDecorate %type_MyTBuffer 2 NonWritable
+// CHECK: OpDecorate %type_MyTBuffer BufferBlock
 
 tbuffer MyTBuffer {
     uint16_t2 gVal1; // 16-bit vector