Fixup silly compilation errors

Author: rauhul

lib/IRGen/GenDecl.cpp

@@ -3297,7 +3297,7 @@ llvm::Constant *swift::irgen::emitCXXConstructorThunkIfNeeded(
   llvm::Function *thunk = llvm::Function::Create(
       assumedFnType, llvm::Function::PrivateLinkage, name, &IGM.Module);
 
-  thunk->setCallingConv(IGM.getOptions().PlatformCCallingConvention());
+  thunk->setCallingConv(IGM.getOptions().PlatformCCallingConvention);
 
   llvm::AttrBuilder attrBuilder(IGM.getLLVMContext());
   IGM.constructInitialFnAttributes(attrBuilder);

lib/IRGen/GenHeap.cpp

@@ -1978,7 +1978,7 @@ emitHeapMetadataRefForUnknownHeapObject(IRGenFunction &IGF,
   auto metadata = IGF.Builder.CreateCall(
       IGF.IGM.getGetObjectClassFunctionPointer(), object);
   metadata->setName(object->getName() + ".Type");
-  metadata->setCallingConv(IGM.getOptions().PlatformCCallingConvention());
+  metadata->setCallingConv(IGF.IGM.getOptions().PlatformCCallingConvention);
   metadata->setDoesNotThrow();
   metadata->addFnAttr(llvm::Attribute::ReadOnly);
   return metadata;

lib/IRGen/IRGenModule.cpp

@@ -570,7 +570,7 @@ IRGenModule::IRGenModule(IRGenerator &irgen,
   InvariantNode = llvm::MDNode::get(getLLVMContext(), {});
   DereferenceableID = getLLVMContext().getMDKindID("dereferenceable");
 
-  C_CC = IGM.getOptions().PlatformCCallingConvention();
+  C_CC = getOptions().PlatformCCallingConvention;
   // TODO: use "tinycc" on platforms that support it
   DefaultCC = SWIFT_DEFAULT_LLVM_CC;
   SwiftCC = llvm::CallingConv::Swift;