Remove updateX functions for template parts (#18714)

Author: weswigham

src/compiler/factory.ts

@@ -1213,48 +1213,24 @@ namespace ts {
         return node;
     }
 
-    export function updateTemplateHead(node: TemplateHead, text: string) {
-        return node.text !== text
-            ? updateNode(createTemplateHead(text), node)
-            : node;
-    }
-
     export function createTemplateMiddle(text: string) {
         const node = <TemplateMiddle>createSynthesizedNode(SyntaxKind.TemplateMiddle);
         node.text = text;
         return node;
     }
 
-    export function updateTemplateMiddle(node: TemplateMiddle, text: string) {
-        return node.text !== text
-            ? updateNode(createTemplateMiddle(text), node)
-            : node;
-    }
-
     export function createTemplateTail(text: string) {
         const node = <TemplateTail>createSynthesizedNode(SyntaxKind.TemplateTail);
         node.text = text;
         return node;
     }
 
-    export function updateTemplateTail(node: TemplateTail, text: string) {
-        return node.text !== text
-            ? updateNode(createTemplateTail(text), node)
-            : node;
-    }
-
     export function createNoSubstitutionTemplateLiteral(text: string) {
         const node = <NoSubstitutionTemplateLiteral>createSynthesizedNode(SyntaxKind.NoSubstitutionTemplateLiteral);
         node.text = text;
         return node;
     }
 
-    export function updateNoSubstitutionTemplateLiteral(node: NoSubstitutionTemplateLiteral, text: string) {
-        return node.text !== text
-        ? updateNode(createNoSubstitutionTemplateLiteral(text), node)
-        : node;
-    }
-
     export function createYield(expression?: Expression): YieldExpression;
     export function createYield(asteriskToken: AsteriskToken, expression: Expression): YieldExpression;
     export function createYield(asteriskTokenOrExpression?: AsteriskToken | Expression, expression?: Expression) {