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/infinite-loop.ll b/llvm/test/CodeGen/AMDGPU/infinite-loop.ll
index 3e0b695..7348275 100644
--- a/llvm/test/CodeGen/AMDGPU/infinite-loop.ll
+++ b/llvm/test/CodeGen/AMDGPU/infinite-loop.ll
@@ -7,7 +7,7 @@
 ; SI: buffer_store_dword [[REG]]
 ; SI: s_waitcnt vmcnt(0) expcnt(0)
 ; SI: s_branch BB0_1
-define void @infinite_loop(i32 addrspace(1)* %out) {
+define amdgpu_kernel void @infinite_loop(i32 addrspace(1)* %out) {
 entry:
   br label %for.body