[MC] Clean up tests that depend on implicit .text in MCAsmStreamer

AMDGPUTargetAsmStreamer::EmitDirectiveAMDGCNTarget called by
onBeginOfFile emits .amdgcn_target, which will not be before
.text when we change the .text parser to actually print .text .
The current .text is from initSections.

Author: MaskRay

llvm/test/MC/AMDGPU/hsa-exp.s

@@ -13,9 +13,6 @@
 // ELF: Section: .text
 // ELF: }
 
-.text
-// ASM: .text
-
 .amdgcn_target "amdgcn-unknown-amdhsa--gfx700"
 // ASM: .amdgcn_target "amdgcn-unknown-amdhsa--gfx700"
 

llvm/test/MC/AMDGPU/hsa-gfx12-v4.s

@@ -47,7 +47,6 @@
 // OBJDUMP-NEXT: 00f0 00000c60 80000000 00040000 00000000
 
 .text
-// ASM: .text
 
 .amdgcn_target "amdgcn-amd-amdhsa--gfx1200"
 // ASM: .amdgcn_target "amdgcn-amd-amdhsa--gfx1200"

llvm/test/MC/AMDGPU/hsa-tg-split.s

@@ -8,9 +8,6 @@
 // OBJDUMP-NEXT: 0020 00000000 00000000 00000000 00000100
 // OBJDUMP-NEXT: 0030 0000ac00 80000000 00000000 00000000
 
-.text
-// ASM: .text
-
 .amdgcn_target "amdgcn-amd-amdhsa--gfx90a:xnack+"
 // ASM: .amdgcn_target "amdgcn-amd-amdhsa--gfx90a:xnack+"
 

llvm/test/MC/AMDGPU/hsa-v4.s

@@ -46,9 +46,6 @@
 // OBJDUMP-NEXT: 00e0 00000000 00000000 00000000 00000000
 // OBJDUMP-NEXT: 00f0 0000ac00 80000000 00000000 00000000
 
-.text
-// ASM: .text
-
 .amdgcn_target "amdgcn-amd-amdhsa--gfx904:xnack+"
 // ASM: .amdgcn_target "amdgcn-amd-amdhsa--gfx904:xnack+"
 

llvm/test/MC/AMDGPU/hsa-v5-uses-dynamic-stack.s

@@ -51,9 +51,6 @@
 // OBJDUMP-NEXT: 00e0 00000000 00000000 00000000 00000000
 // OBJDUMP-NEXT: 00f0 0000ac00 80000000 00000000 00000000
 
-.text
-// ASM: .text
-
 .amdgcn_target "amdgcn-amd-amdhsa--gfx904:xnack+"
 // ASM: .amdgcn_target "amdgcn-amd-amdhsa--gfx904:xnack+"
 

llvm/test/MC/AMDGPU/user-sgpr-count.s

@@ -1,8 +1,5 @@
 // RUN: llvm-mc -triple amdgcn-amd-amdhsa -mcpu=gfx90a --amdhsa-code-object-version=4 -mattr=+xnack < %s | FileCheck --check-prefix=ASM %s
 
-.text
-// ASM: .text
-
 .amdgcn_target "amdgcn-amd-amdhsa--gfx90a:xnack+"
 // ASM: .amdgcn_target "amdgcn-amd-amdhsa--gfx90a:xnack+"