updates for OpenCL C 3.0

OpenCL C 3.0 is a derivative of OpenCL C 2.0 and not OpenCL C++.
Run the OpenCL C++ passes for OpenCL 2.1 only, and run similar
OpenCL C 2.0 passes for OpenCL C 3.0.

Author: bashbaug

llvm-spirv/lib/SPIRV/OCL20ToSPIRV.cpp

@@ -329,7 +329,7 @@ bool OCL20ToSPIRV::runOnModule(Module &Module) {
     return false;
 
   CLVer = std::get<1>(Src);
-  if (CLVer > kOCLVer::CL20)
+  if (CLVer == kOCLVer::CL21)
     return false;
 
   LLVM_DEBUG(dbgs() << "Enter OCL20ToSPIRV:\n");
@@ -406,7 +406,8 @@ void OCL20ToSPIRV::visitCallInst(CallInst &CI) {
         DemangledName == kOCLBuiltinName::AtomicCmpXchgStrong ||
         DemangledName == kOCLBuiltinName::AtomicCmpXchgWeakExplicit ||
         DemangledName == kOCLBuiltinName::AtomicCmpXchgStrongExplicit) {
-      assert(CLVer == kOCLVer::CL20 && "Wrong version of OpenCL");
+      assert((CLVer == kOCLVer::CL20 || CLVer == kOCLVer::CL30) &&
+             "Wrong version of OpenCL");
       PCI = visitCallAtomicCmpXchg(PCI);
     }
     visitCallAtomicLegacy(PCI, MangledName, DemangledName);

llvm-spirv/lib/SPIRV/OCL21ToSPIRV.cpp

@@ -107,7 +107,7 @@ bool OCL21ToSPIRV::runOnModule(Module &Module) {
     return false;
 
   CLVer = std::get<1>(Src);
-  if (CLVer < kOCLVer::CL21)
+  if (CLVer != kOCLVer::CL21)
     return false;
 
   LLVM_DEBUG(dbgs() << "Enter OCL21ToSPIRV:\n");

llvm-spirv/lib/SPIRV/OCLUtil.h

@@ -321,6 +321,7 @@ namespace kOCLVer {
 const unsigned CL12 = 102000;
 const unsigned CL20 = 200000;
 const unsigned CL21 = 201000;
+const unsigned CL30 = 300000;
 } // namespace kOCLVer
 
 namespace OclExt {

llvm-spirv/lib/SPIRV/PreprocessMetadata.cpp

@@ -207,8 +207,8 @@ void PreprocessMetadata::preprocessOCLMetadata(Module *M, SPIRVMDBuilder *B,
   // !{x} = !{i32 3, i32 102000}
   B->addNamedMD(kSPIRVMD::Source)
       .addOp()
-      .add(CLVer < kOCLVer::CL21 ? spv::SourceLanguageOpenCL_C
-                                 : spv::SourceLanguageOpenCL_CPP)
+      .add(CLVer == kOCLVer::CL21 ? spv::SourceLanguageOpenCL_CPP
+                                  : spv::SourceLanguageOpenCL_C)
       .add(CLVer)
       .done();
   if (EraseOCLMD)