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/r600-legalize-umax-bug.ll b/llvm/test/CodeGen/AMDGPU/r600-legalize-umax-bug.ll
index 866a4a9..b7ed34b 100644
--- a/llvm/test/CodeGen/AMDGPU/r600-legalize-umax-bug.ll
+++ b/llvm/test/CodeGen/AMDGPU/r600-legalize-umax-bug.ll
@@ -2,7 +2,7 @@
 ; Don't crash
 
 ; CHECK: MAX_UINT
-define void @test(i64 addrspace(1)* %out) {
+define amdgpu_kernel void @test(i64 addrspace(1)* %out) {
 bb:
   store i64 2, i64 addrspace(1)* %out
   %tmp = load i64, i64 addrspace(1)* %out