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/i8-to-double-to-float.ll b/llvm/test/CodeGen/AMDGPU/i8-to-double-to-float.ll
index c218e19..d501be5 100644
--- a/llvm/test/CodeGen/AMDGPU/i8-to-double-to-float.ll
+++ b/llvm/test/CodeGen/AMDGPU/i8-to-double-to-float.ll
@@ -2,7 +2,7 @@
 
 ;CHECK: UINT_TO_FLT * T{{[0-9]+\.[XYZW], T[0-9]+\.[XYZW]}}
 
-define void @test(float addrspace(1)* %out, i8 addrspace(1)* %in) {
+define amdgpu_kernel void @test(float addrspace(1)* %out, i8 addrspace(1)* %in) {
   %1 = load i8, i8 addrspace(1)* %in
   %2 = uitofp i8 %1 to double
   %3 = fptrunc double %2 to float