[NFC][AMDGPU] Move buffer_load lds test from gfx11_asm_mubuf.s to gfx11_asm_mubuf_err.s (#132938)

The test checked that the lds flag for buffer_load instructions was not
supported. These should be moved to the _err counterpart of the tests.

Author: jmmartinez

llvm/test/MC/AMDGPU/gfx11_asm_mubuf.s

@@ -1,5 +1,4 @@
-// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1100 -show-encoding %s | FileCheck --check-prefix=GFX11 %s
-// RUN: not llvm-mc -triple=amdgcn -mcpu=gfx1100 -show-encoding %s 2>&1 | FileCheck --check-prefixes=GFX11-ERR --implicit-check-not=error: %s
+// RUN: llvm-mc -triple=amdgcn -mcpu=gfx1100 -show-encoding %s | FileCheck --check-prefix=GFX11 %s
 
 buffer_gl0_inv
 // GFX11: encoding: [0x00,0x00,0xac,0xe0,0x00,0x00,0x00,0x00]
@@ -64,9 +63,6 @@ buffer_load_b32 v5, off, s[8:11], s3 offset:4095 dlc
 buffer_load_b32 v5, off, s[8:11], s3 offset:4095 glc slc dlc
 // GFX11: encoding: [0xff,0x7f,0x50,0xe0,0x00,0x05,0x02,0x03]
 
-buffer_load_b32 v5, off, s[8:11], s3 offset:4095 lds
-// GFX11-ERR: :[[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
-
 buffer_load_b64 v[5:6], off, s[8:11], s3 offset:4095
 // GFX11: encoding: [0xff,0x0f,0x54,0xe0,0x00,0x05,0x02,0x03]
 

llvm/test/MC/AMDGPU/gfx11_asm_mubuf_err.s

@@ -99,6 +99,9 @@ buffer_load_b128 v[5:8], v0, null, s3 offen offset:4095
 buffer_load_b32 v5, v0, null, s3 offen offset:4095
 // NOGFX11: :[[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
 
+buffer_load_b32 v5, off, s[8:11], s3 offset:4095 lds
+// NOGFX11: :[[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction
+
 buffer_store_b64 v[1:2], v0, null, s4 idxen offset:4095
 // NOGFX11: :[[@LINE-1]]:{{[0-9]+}}: error: invalid operand for instruction