LLVMInstructionList: Add missing const qualifiers

Author: adazem009

src/engine/internal/llvm/llvminstructionlist.cpp

@@ -7,12 +7,12 @@
 
 using namespace libscratchcpp;
 
-LLVMInstruction *LLVMInstructionList::first()
+LLVMInstruction *LLVMInstructionList::first() const
 {
     return m_first.get();
 }
 
-LLVMInstruction *LLVMInstructionList::last()
+LLVMInstruction *LLVMInstructionList::last() const
 {
     return m_last.get();
 }

src/engine/internal/llvm/llvminstructionlist.h

@@ -15,8 +15,8 @@ class LLVMInstructionList
         LLVMInstructionList() = default;
         LLVMInstructionList(const LLVMInstructionList &) = delete;
 
-        LLVMInstruction *first();
-        LLVMInstruction *last();
+        LLVMInstruction *first() const;
+        LLVMInstruction *last() const;
 
         void addInstruction(std::shared_ptr<LLVMInstruction> ins);