[OpenCL] Fix OpenCL/SPIR version metadata

[Anastasia]

Summary

C++ is derived from OpenCL v2.0 therefore set the versions to the same.

In the future we might need to add extra version for CXX.

[svenvh]

LGTM!

lib/CodeGen/CodeGenModule.cpp

void CodeGenModule::Release() {
 
   // Emit OpenCL specific module metadata: OpenCL/SPIR version.
   if (LangOpts.OpenCL) {
     EmitOpenCLMetadata();
     // Emit SPIR version.
     if (getTriple().isSPIR()) {
       // SPIR v2.0 s2.12 - The SPIR version used by the module is stored in the
       // opencl.spir.version named metadata.
+      // C++ is backwards compatible with v2.0.
+      auto Version = LangOpts.OpenCLCPlusPlus ? 200 : LangOpts.OpenCLVersion;
       llvm::Metadata *SPIRVerElts[] = {
           llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
-              Int32Ty, LangOpts.OpenCLVersion / 100)),
+              Int32Ty, Version / 100)),
           llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
-              Int32Ty, (LangOpts.OpenCLVersion / 100 > 1) ? 0 : 2))};
+              Int32Ty, (Version / 100 > 1) ? 0 : 2))};
       llvm::NamedMDNode *SPIRVerMD =
           TheModule.getOrInsertNamedMetadata("opencl.spir.version");
       llvm::LLVMContext &Ctx = TheModule.getContext();
       SPIRVerMD->addOperand(llvm::MDNode::get(Ctx, SPIRVerElts));
     }
   }
 
   if (uint32_t PLevel = Context.getLangOpts().PICLevel) {
if (!getCodeGenOpts().RecordCommandLine.empty())
     EmitCommandLineMetadata();
 
   EmitTargetMetadata();
 }
 
 void CodeGenModule::EmitOpenCLMetadata() {
   // SPIR v2.0 s2.13 - The OpenCL version used by the module is stored in the
   // opencl.ocl.version named metadata node.
+  // C++ is backwards compatible with v2.0.
+  // FIXME: We might need to add CXX version at some point too?
+  auto Version = LangOpts.OpenCLCPlusPlus ? 200 : LangOpts.OpenCLVersion;
   llvm::Metadata *OCLVerElts[] = {
       llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
-          Int32Ty, LangOpts.OpenCLVersion / 100)),
+          Int32Ty, Version / 100)),
       llvm::ConstantAsMetadata::get(llvm::ConstantInt::get(
-          Int32Ty, (LangOpts.OpenCLVersion % 100) / 10))};
+          Int32Ty, (Version % 100) / 10))};
   llvm::NamedMDNode *OCLVerMD =
       TheModule.getOrInsertNamedMetadata("opencl.ocl.version");
   llvm::LLVMContext &Ctx = TheModule.getContext();
   OCLVerMD->addOperand(llvm::MDNode::get(Ctx, OCLVerElts));
 }
 
 void CodeGenModule::UpdateCompletedType(const TagDecl *TD) {
   // Make sure that this type is translated.

test/CodeGenOpenCL/spir_version.cl

 // RUN: %clang_cc1 %s -triple "spir-unknown-unknown" -emit-llvm -o - | FileCheck %s --check-prefix=CHECK-SPIR-CL10
 // RUN: %clang_cc1 %s -triple "spir-unknown-unknown" -emit-llvm -o - -cl-std=CL1.2 | FileCheck %s --check-prefix=CHECK-SPIR-CL12
 // RUN: %clang_cc1 %s -triple "spir-unknown-unknown" -emit-llvm -o - -cl-std=CL2.0 | FileCheck %s --check-prefix=CHECK-SPIR-CL20
 // RUN: %clang_cc1 %s -triple "spir64-unknown-unknown" -emit-llvm -o - | FileCheck %s --check-prefix=CHECK-SPIR-CL10
 // RUN: %clang_cc1 %s -triple "spir64-unknown-unknown" -emit-llvm -o - -cl-std=CL1.2 | FileCheck %s --check-prefix=CHECK-SPIR-CL12
 // RUN: %clang_cc1 %s -triple "spir64-unknown-unknown" -emit-llvm -o - -cl-std=CL2.0 | FileCheck %s --check-prefix=CHECK-SPIR-CL20
 
+
+// RUN: %clang_cc1 %s -triple "spir64-unknown-unknown" -emit-llvm -o - -cl-std=c++ | FileCheck %s --check-prefix=CHECK-SPIR-CL20
+
 // RUN: %clang_cc1 %s -triple "amdgcn--amdhsa" -emit-llvm -o - | FileCheck %s --check-prefix=CHECK-AMDGCN-CL10
 // RUN: %clang_cc1 %s -triple "amdgcn--amdhsa" -emit-llvm -o - -cl-std=CL1.2 | FileCheck %s --check-prefix=CHECK-AMDGCN-CL12
 // RUN: %clang_cc1 %s -triple "amdgcn--amdhsa" -emit-llvm -o - -cl-std=CL2.0 | FileCheck %s --check-prefix=CHECK-AMDGCN-CL20
 
 kernel void foo() {}
 kernel void bar() {}
 
 // CHECK-SPIR-CL10-DAG: !opencl.spir.version = !{[[SPIR:![0-9]+]]}