simplify the loadConst function, it doesn't need to initialize in a register

src/asm_writing/rewriter.cpp

@@ -620,21 +620,11 @@ RewriterVar* Rewriter::loadConst(int64_t val, Location dest) {
         return var;
     } else {
         RewriterVar* result = createNewConstantVar(val);
-        addAction([=]() { this->_loadConst(result, val, dest); }, {}, ActionType::NORMAL);
         const_loader_var = result;
         return result;
     }
 }
 
-void Rewriter::_loadConst(RewriterVar* result, int64_t val, Location dest) {
-    assembler::Register reg = allocReg(dest);
-    const_loader.loadConstIntoReg(val, reg);
-    result->initializeInReg(reg);
-
-    result->releaseIfNoUses();
-    assertConsistent();
-}
-
 RewriterVar* Rewriter::call(bool can_call_into_python, void* func_addr) {
     RewriterVar::SmallVector args;
     RewriterVar::SmallVector args_xmm;

src/asm_writing/rewriter.h

@@ -420,7 +420,7 @@ private:
     bool finishAssembly(ICSlotInfo* picked_slot, int continue_offset) override;
 
     void _trap();
-    void _loadConst(RewriterVar* result, int64_t val, Location loc);
+    void _loadConst(RewriterVar* result, int64_t val);
     void _call(RewriterVar* result, bool can_call_into_python, void* func_addr, const RewriterVar::SmallVector& args,
                const RewriterVar::SmallVector& args_xmm);
     void _add(RewriterVar* result, RewriterVar* a, int64_t b, Location dest);