AMDGPU: Mark all unspecified CC functions in tests as amdgpu_kernel

Currently the default C calling convention functions are treated
the same as compute kernels. Make this explicit so the default
calling convention can be changed to a non-kernel.

Converted with perl -pi -e 's/define void/define amdgpu_kernel void/'
on the relevant test directories (and undoing in one place that actually
wanted a non-kernel).

llvm-svn: 298444
diff --git a/llvm/test/CodeGen/AMDGPU/combine_vloads.ll b/llvm/test/CodeGen/AMDGPU/combine_vloads.ll
index 01572af..f8d4e01 100644
--- a/llvm/test/CodeGen/AMDGPU/combine_vloads.ll
+++ b/llvm/test/CodeGen/AMDGPU/combine_vloads.ll
@@ -12,7 +12,7 @@
 ; EG-LABEL: {{^}}combine_vloads:
 ; EG: VTX_READ_128
 ; EG: VTX_READ_128
-define void @combine_vloads(<8 x i8> addrspace(1)* nocapture %src, <8 x i8> addrspace(1)* nocapture %result) nounwind {
+define amdgpu_kernel void @combine_vloads(<8 x i8> addrspace(1)* nocapture %src, <8 x i8> addrspace(1)* nocapture %result) nounwind {
 entry:
   br label %for.body