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/schedule-if.ll b/llvm/test/CodeGen/AMDGPU/schedule-if.ll
index 6637b38..feac5d9 100644
--- a/llvm/test/CodeGen/AMDGPU/schedule-if.ll
+++ b/llvm/test/CodeGen/AMDGPU/schedule-if.ll
@@ -1,7 +1,7 @@
 ;RUN: llc < %s -march=r600 -mcpu=cayman -stress-sched -verify-misched -verify-machineinstrs
 ;REQUIRES: asserts
 
-define void @main() {
+define amdgpu_kernel void @main() {
 main_body:
   %0 = load <4 x float>, <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>], [1024 x <4 x float>] addrspace(8)* null, i64 0, i32 1)
   %1 = extractelement <4 x float> %0, i32 0