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/scalar-store-cache-flush.mir b/llvm/test/CodeGen/AMDGPU/scalar-store-cache-flush.mir
index af71086..f4ef1c8 100644
--- a/llvm/test/CodeGen/AMDGPU/scalar-store-cache-flush.mir
+++ b/llvm/test/CodeGen/AMDGPU/scalar-store-cache-flush.mir
@@ -1,23 +1,23 @@
 # RUN: llc -march=amdgcn -run-pass si-insert-waits %s -o - | FileCheck %s
 
 --- |
-  define void @basic_insert_dcache_wb() {
+  define amdgpu_kernel void @basic_insert_dcache_wb() {
     ret void
   }
 
-  define void @explicit_flush_after() {
+  define amdgpu_kernel void @explicit_flush_after() {
     ret void
   }
 
-  define void @explicit_flush_before() {
+  define amdgpu_kernel void @explicit_flush_before() {
     ret void
   }
 
-  define void @no_scalar_store() {
+  define amdgpu_kernel void @no_scalar_store() {
     ret void
   }
 
-  define void @multi_block_store() {
+  define amdgpu_kernel void @multi_block_store() {
   bb0:
     br i1 undef, label %bb1, label %bb2
 
@@ -28,7 +28,7 @@
     ret void
   }
 
-  define void @one_block_store() {
+  define amdgpu_kernel void @one_block_store() {
   bb0:
     br i1 undef, label %bb1, label %bb2