Rename OCL20ToSPIRV pass

Renamed the pass to OCLToSPIRV: the problem with the old name is that it
doesn't represent actual pass content: it handles not only OpenCL C 2.0
built-in functions, but also OpenCL C 1.2 built-in functions, acting
like an adapter between OpenCL C representation and SPIR-V friendly IR
representation. Also updated some comments to reflect that.

Author: AlexeySachkov

llvm-spirv/include/LLVMSPIRVLib.h

@@ -51,7 +51,7 @@ namespace llvm {
 // PassSupport.h.
 class PassRegistry;
 void initializeLLVMToSPIRVPass(PassRegistry &);
-void initializeOCL20ToSPIRVPass(PassRegistry &);
+void initializeOCLToSPIRVPass(PassRegistry &);
 void initializeOCL21ToSPIRVPass(PassRegistry &);
 void initializeOCLTypeToSPIRVPass(PassRegistry &);
 void initializeSPIRVLowerBoolPass(PassRegistry &);
@@ -162,9 +162,9 @@ void mangleOpenClBuiltin(const std::string &UnmangledName,
 /// Create a pass for translating LLVM to SPIR-V.
 ModulePass *createLLVMToSPIRV(SPIRV::SPIRVModule *);
 
-/// Create a pass for translating OCL 2.0 builtin functions to SPIR-V builtin
+/// Create a pass for translating OCL C builtin functions to SPIR-V builtin
 /// functions.
-ModulePass *createOCL20ToSPIRV();
+ModulePass *createOCLToSPIRV();
 
 /// Create a pass for translating OCL 2.1 builtin functions to SPIR-V builtin
 /// functions.

llvm-spirv/lib/SPIRV/CMakeLists.txt

@@ -4,7 +4,7 @@ add_llvm_library(LLVMSPIRVLib
   Mangler/Mangler.cpp
   Mangler/ManglingUtils.cpp
   Mangler/ParameterType.cpp
-  OCL20ToSPIRV.cpp
+  OCLToSPIRV.cpp
   OCL21ToSPIRV.cpp
   OCLTypeToSPIRV.cpp
   OCLUtil.cpp