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/basic-loop.ll b/llvm/test/CodeGen/AMDGPU/basic-loop.ll
index f0263ca..de45190 100644
--- a/llvm/test/CodeGen/AMDGPU/basic-loop.ll
+++ b/llvm/test/CodeGen/AMDGPU/basic-loop.ll
@@ -2,7 +2,7 @@
 ; RUN: llc -O0 -verify-machineinstrs -march=amdgcn -mcpu=tonga < %s | FileCheck %s
 
 ; CHECK-LABEL: {{^}}test_loop:
-define void @test_loop(i32 addrspace(1)* noalias %out, i32 addrspace(1)* noalias %in, i32 %val) nounwind {
+define amdgpu_kernel void @test_loop(i32 addrspace(1)* noalias %out, i32 addrspace(1)* noalias %in, i32 %val) nounwind {
 entry:
   br label %loop.body