[AMDGPU][True16][MC] fix a typo in fake16 test (llvm#117033)

This is a NFC change to fix a typo in dasm test of VOPC instructions.

Fake16 test should use "-real-true16" attribute. Test are passing
previously because the true16 of VOPC instructions are not yet
implemented

Author: broxigarchen

llvm/test/MC/AMDGPU/gfx11_asm_vop3_from_vopc-fake16.s

@@ -1,7 +1,7 @@
-// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize32,+real-true16 -show-encoding %s | FileCheck --check-prefixes=GFX11,W32 %s
-// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize64,+real-true16 -show-encoding %s | FileCheck --check-prefixes=GFX11,W64 %s
-// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize32,+real-true16 -filetype=null %s 2>&1 | FileCheck --check-prefix=W32-ERR --implicit-check-not=error: %s
-// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize64,+real-true16 -filetype=null %s 2>&1 | FileCheck --check-prefix=W64-ERR --implicit-check-not=error: %s
+// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize32,-real-true16 -show-encoding %s | FileCheck --check-prefixes=GFX11,W32 %s
+// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize64,-real-true16 -show-encoding %s | FileCheck --check-prefixes=GFX11,W64 %s
+// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize32,-real-true16 -filetype=null %s 2>&1 | FileCheck --check-prefix=W32-ERR --implicit-check-not=error: %s
+// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1100 -mattr=+wavefrontsize64,-real-true16 -filetype=null %s 2>&1 | FileCheck --check-prefix=W64-ERR --implicit-check-not=error: %s
 
 v_cmp_class_f16_e64 s5, v1, v2
 // W32: encoding: [0x05,0x00,0x7d,0xd4,0x01,0x05,0x02,0x00]

llvm/test/MC/AMDGPU/gfx12_asm_vop3c-fake16.s

@@ -1,7 +1,7 @@
-// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1200 -mattr=+wavefrontsize32,+real-true16 -show-encoding %s | FileCheck --check-prefixes=GFX12,W32 %s
-// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1200 -mattr=+wavefrontsize64,+real-true16 -show-encoding %s | FileCheck --check-prefixes=GFX12,W64 %s
-// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1200 -mattr=+wavefrontsize32,+real-true16 -filetype=null %s 2>&1 | FileCheck --check-prefix=W32-ERR --implicit-check-not=error: %s
-// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1200 -mattr=+wavefrontsize64,+real-true16 -filetype=null %s 2>&1 | FileCheck --check-prefix=W64-ERR --implicit-check-not=error: %s
+// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1200 -mattr=+wavefrontsize32,-real-true16 -show-encoding %s | FileCheck --check-prefixes=GFX12,W32 %s
+// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1200 -mattr=+wavefrontsize64,-real-true16 -show-encoding %s | FileCheck --check-prefixes=GFX12,W64 %s
+// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1200 -mattr=+wavefrontsize32,-real-true16 -filetype=null %s 2>&1 | FileCheck --check-prefix=W32-ERR --implicit-check-not=error: %s
+// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1200 -mattr=+wavefrontsize64,-real-true16 -filetype=null %s 2>&1 | FileCheck --check-prefix=W64-ERR --implicit-check-not=error: %s
 
 v_cmp_class_f16_e64 s5, v1, v2
 // W32: encoding: [0x05,0x00,0x7d,0xd4,0x01,0x05,0x02,0x00]