AMDGPU/SI: Add amdgpu_kernel calling convention. Part 2.

Summary:
    Check calling convention in AMDGPUMachineFunction::isKernel

    This will be used for AMDGPU_HSA_KERNEL symbol type in output ELF.

    Also, in the future unused non-kernels may be optimized.

    Reviewers: tstellarAMD, arsenm

    Subscribers: arsenm, joker.eph, llvm-commits

    Differential Revision: http://reviews.llvm.org/D19917

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268719 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/AMDGPU/AMDGPUMachineFunction.cpp

@@ -13,5 +13,12 @@ AMDGPUMachineFunction::AMDGPUMachineFunction(const MachineFunction &MF) :
   LDSSize(0),
   ABIArgOffset(0),
   ScratchSize(0),
-  IsKernel(true) {
+  IsKernel(MF.getFunction()->getCallingConv() == llvm::CallingConv::AMDGPU_KERNEL ||
+           MF.getFunction()->getCallingConv() == llvm::CallingConv::SPIR_KERNEL)
+{
+}
+
+bool AMDGPUMachineFunction::isKernel() const
+{
+  return IsKernel;
 }