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/insert_subreg.ll b/llvm/test/CodeGen/AMDGPU/insert_subreg.ll
index 4a5e886..e895f27 100644
--- a/llvm/test/CodeGen/AMDGPU/insert_subreg.ll
+++ b/llvm/test/CodeGen/AMDGPU/insert_subreg.ll
@@ -6,7 +6,7 @@
 
 ; Make sure this doesn't crash
 ; CHECK-LABEL: test:
-define void @test(i64 addrspace(1)* %out) {
+define amdgpu_kernel void @test(i64 addrspace(1)* %out) {
 entry:
   %tmp0 = alloca [16 x i32]
   %tmp1 = ptrtoint [16 x i32]* %tmp0 to i32