[AMDGPU][MC][NFC] Fix GFX1250 VOP1 True16 tests. (#162285)

Completes resolving
<#161381>.

Author: kosarev

llvm/test/MC/AMDGPU/gfx1250_asm_vop1.s

@@ -1,5 +1,6 @@
 // NOTE: Assertions have been autogenerated by utils/update_mc_test_checks.py UTC_ARGS: --version 5
 // RUN: llvm-mc -triple=amdgcn -mcpu=gfx1250 -mattr=+real-true16 -show-encoding %s | FileCheck --check-prefix=GFX1250 %s
+// RUN: llvm-mc -triple=amdgcn -mcpu=gfx1250 -mattr=+real-true16 -show-encoding %s | %extract-encodings | llvm-mc -triple=amdgcn -mcpu=gfx1250 -mattr=+real-true16 -disassemble -show-encoding | FileCheck --check-prefixes=GFX1250 %s
 
 v_mov_b64_e32 v[4:5], v[2:3]
 // GFX1250: v_mov_b64_e32 v[4:5], v[2:3]            ; encoding: [0x02,0x3b,0x08,0x7e]
@@ -628,17 +629,17 @@ v_cvt_f16_fp8 v1.l, 0x1234
 v_cvt_f16_fp8 v1.h, v2
 // GFX1250: v_cvt_f16_fp8_e32 v1.h, v2              ; encoding: [0x02,0xef,0x02,0x7f]
 
-v_cvt_pk_f16_bf8 v1, v2
-// GFX1250: v_cvt_pk_f16_bf8 v1, v2                 ; encoding: [0x02,0xed,0x02,0x7e]
+v_cvt_pk_f16_bf8 v1, v2.l
+// GFX1250: v_cvt_pk_f16_bf8 v1, v2.l               ; encoding: [0x02,0xed,0x02,0x7e]
 
 v_cvt_pk_f16_bf8 v1, s2
 // GFX1250: v_cvt_pk_f16_bf8 v1, s2                 ; encoding: [0x02,0xec,0x02,0x7e]
 
 v_cvt_pk_f16_bf8 v1, 100
 // GFX1250: v_cvt_pk_f16_bf8 v1, 0x64               ; encoding: [0xff,0xec,0x02,0x7e,0x64,0x00,0x00,0x00]
 
-v_cvt_pk_f16_fp8 v1, v2
-// GFX1250: v_cvt_pk_f16_fp8 v1, v2                 ; encoding: [0x02,0xeb,0x02,0x7e]
+v_cvt_pk_f16_fp8 v1, v2.l
+// GFX1250: v_cvt_pk_f16_fp8 v1, v2.l               ; encoding: [0x02,0xeb,0x02,0x7e]
 
 v_cvt_pk_f16_fp8 v1, s2
 // GFX1250: v_cvt_pk_f16_fp8 v1, s2                 ; encoding: [0x02,0xea,0x02,0x7e]
@@ -694,8 +695,8 @@ v_cvt_pk_f32_fp8_e32 v[2:3], s3
 v_cvt_pk_f32_fp8_e32 v[2:3], 3
 // GFX1250: v_cvt_pk_f32_fp8_e32 v[2:3], 3          ; encoding: [0x83,0xdc,0x04,0x7e]
 
-v_cvt_pk_f32_fp8_e32 v[2:3], v3
-// GFX1250: v_cvt_pk_f32_fp8_e32 v[2:3], v3         ; encoding: [0x03,0xdd,0x04,0x7e]
+v_cvt_pk_f32_fp8_e32 v[2:3], v3.l
+// GFX1250: v_cvt_pk_f32_fp8_e32 v[2:3], v3.l       ; encoding: [0x03,0xdd,0x04,0x7e]
 
 v_cvt_pk_f32_fp8_e32 v[4:5], v127.h
 // GFX1250: v_cvt_pk_f32_fp8_e32 v[4:5], v127.h     ; encoding: [0xff,0xdd,0x08,0x7e]