Support LLVM 12 interface change for getTypeByName

fe43168 in llvm master
changed how this API is used.

Signed-off-by: Dave Airlie <airlied@redhat.com>

Author: airlied

llvm-spirv/lib/SPIRV/SPIRVReader.cpp

@@ -519,7 +519,7 @@ Type *SPIRVToLLVM::transType(SPIRVType *T, bool IsClassMember) {
     auto ST = static_cast<SPIRVTypeStruct *>(T);
     auto Name = ST->getName();
     if (!Name.empty()) {
-      if (auto OldST = StructType::getTypeByName(M->getContext(), Name))
+      if (auto OldST = StructType::getTypeByName(*Context, Name))
         OldST->setName("");
     } else {
       Name = "structtype";
@@ -1472,7 +1472,7 @@ Value *SPIRVToLLVM::oclTransConstantPipeStorage(
                    kSPIRVTypeName::ConstantPipeStorage;
 
   auto Int32Ty = IntegerType::getInt32Ty(*Context);
-  auto CPSTy = StructType::getTypeByName(M->getContext(), CPSName);
+  auto CPSTy = StructType::getTypeByName(*Context, CPSName);
   if (!CPSTy) {
     Type *CPSElemsTy[] = {Int32Ty, Int32Ty, Int32Ty};
     CPSTy = StructType::create(*Context, CPSElemsTy, CPSName);