Pool sourceMapState tool (#1320)

Author: jakebailey

internal/printer/printer.go

@@ -137,6 +137,7 @@ type Printer struct {
 	nameGenerator                     NameGenerator
 	makeFileLevelOptimisticUniqueName func(string) string
 	commentStatePool                  core.Pool[commentState]
+	sourceMapStatePool                core.Pool[sourceMapState]
 }
 
 type detachedCommentsInfo struct {
@@ -5489,7 +5490,9 @@ func (p *Printer) emitSourceMapsBeforeNode(node *ast.Node) *sourceMapState {
 		p.sourceMapsDisabled = true
 	}
 
-	return &sourceMapState{emitFlags, loc, false}
+	state := p.sourceMapStatePool.New()
+	*state = sourceMapState{emitFlags, loc, false}
+	return state
 }
 
 func (p *Printer) emitSourceMapsAfterNode(node *ast.Node, previousState *sourceMapState) {
@@ -5527,7 +5530,9 @@ func (p *Printer) emitSourceMapsBeforeToken(token ast.Kind, pos int, contextNode
 		}
 	}
 
-	return &sourceMapState{emitFlags, loc, hasLoc}
+	state := p.sourceMapStatePool.New()
+	*state = sourceMapState{emitFlags, loc, hasLoc}
+	return state
 }
 
 func (p *Printer) emitSourceMapsAfterToken(token ast.Kind, pos int, contextNode *ast.Node, previousState *sourceMapState) {