compiler: move Optimize() function to a separate file

In the future, there will be more optimizations. Let's keep them in a
separate file for separation of concerns.

compiler/compiler.go

@@ -3109,33 +3109,6 @@ func (c *Compiler) NonConstGlobals() {
 	}
 }
 
-func (c *Compiler) Optimize(optLevel, sizeLevel int, inlinerThreshold uint) {
-	builder := llvm.NewPassManagerBuilder()
-	defer builder.Dispose()
-	builder.SetOptLevel(optLevel)
-	builder.SetSizeLevel(sizeLevel)
-	if inlinerThreshold != 0 {
-		builder.UseInlinerWithThreshold(inlinerThreshold)
-	}
-	builder.AddCoroutinePassesToExtensionPoints()
-
-	// Run function passes for each function.
-	funcPasses := llvm.NewFunctionPassManagerForModule(c.mod)
-	defer funcPasses.Dispose()
-	builder.PopulateFunc(funcPasses)
-	funcPasses.InitializeFunc()
-	for fn := c.mod.FirstFunction(); !fn.IsNil(); fn = llvm.NextFunction(fn) {
-		funcPasses.RunFunc(fn)
-	}
-	funcPasses.FinalizeFunc()
-
-	// Run module passes.
-	modPasses := llvm.NewPassManager()
-	defer modPasses.Dispose()
-	builder.Populate(modPasses)
-	modPasses.Run(c.mod)
-}
-
 // Emit object file (.o).
 func (c *Compiler) EmitObject(path string) error {
 	llvmBuf, err := c.machine.EmitToMemoryBuffer(c.mod, llvm.ObjectFile)

compiler/optimizer.go

@@ -0,0 +1,32 @@
+package compiler
+
+import (
+	"github.com/aykevl/go-llvm"
+)
+
+func (c *Compiler) Optimize(optLevel, sizeLevel int, inlinerThreshold uint) {
+	builder := llvm.NewPassManagerBuilder()
+	defer builder.Dispose()
+	builder.SetOptLevel(optLevel)
+	builder.SetSizeLevel(sizeLevel)
+	if inlinerThreshold != 0 {
+		builder.UseInlinerWithThreshold(inlinerThreshold)
+	}
+	builder.AddCoroutinePassesToExtensionPoints()
+
+	// Run function passes for each function.
+	funcPasses := llvm.NewFunctionPassManagerForModule(c.mod)
+	defer funcPasses.Dispose()
+	builder.PopulateFunc(funcPasses)
+	funcPasses.InitializeFunc()
+	for fn := c.mod.FirstFunction(); !fn.IsNil(); fn = llvm.NextFunction(fn) {
+		funcPasses.RunFunc(fn)
+	}
+	funcPasses.FinalizeFunc()
+
+	// Run module passes.
+	modPasses := llvm.NewPassManager()
+	defer modPasses.Dispose()
+	builder.Populate(modPasses)
+	modPasses.Run(c.mod)
+}