Compiler: Reduce allocations in tag helper matching (#12134)

This change simplifies and reduces allocations during tag helper
matching in `DefaultRazorIntermediateNodeLoweringPhase`. In addition, a
handful of related intermediate nodes have been cleaned up somewhat,
reducing the number of fields and making things a bit lazier. I
recommend reviewing commit-by-commit as each commit has a descriptive
message.


----
CI Build:
https://dev.azure.com/dnceng/internal/_build/results?buildId=2777461&view=results
Test Insertion:
https://dev.azure.com/devdiv/DevDiv/_git/VS/pullrequest/663965
Toolset Run:
https://dev.azure.com/dnceng/internal/_build/results?buildId=2777462&view=results

Author: DustinCampbell

src/Compiler/Microsoft.AspNetCore.Mvc.Razor.Extensions.Version2_X/test/InstrumentationPassTest.cs

@@ -147,9 +147,17 @@ public void InstrumentationPass_SkipsCSharpExpression_InsideTagHelperAttribute()
 
         var builder = IntermediateNodeBuilder.Create(documentNode);
 
-        builder.Push(new TagHelperIntermediateNode());
+        builder.Push(new TagHelperIntermediateNode()
+        {
+            TagMode = 0,
+            TagName = "Test"
+        });
 
-        builder.Push(new TagHelperHtmlAttributeIntermediateNode());
+        builder.Push(new TagHelperHtmlAttributeIntermediateNode()
+        {
+            AttributeName = "Test",
+            AttributeStructure = 0
+        });
 
         builder.Push(new CSharpExpressionIntermediateNode()
         {
@@ -188,9 +196,17 @@ public void InstrumentationPass_SkipsCSharpExpression_InsideTagHelperProperty()
 
         var builder = IntermediateNodeBuilder.Create(documentNode);
 
-        builder.Push(new TagHelperIntermediateNode());
+        builder.Push(new TagHelperIntermediateNode()
+        {
+            TagMode = 0,
+            TagName = "Test"
+        });
 
-        builder.Push(new TagHelperPropertyIntermediateNode());
+        builder.Push(new TagHelperPropertyIntermediateNode(match: default)
+        {
+            AttributeName = "Test",
+            AttributeStructure = 0
+        });
 
         builder.Push(new CSharpExpressionIntermediateNode()
         {
@@ -231,6 +247,8 @@ public void InstrumentationPass_InstrumentsTagHelper()
 
         builder.Add(new TagHelperIntermediateNode()
         {
+            TagMode = 0,
+            TagName = "Test",
             Source = CreateSource(3)
         });
 
@@ -254,7 +272,11 @@ public void InstrumentationPass_SkipsTagHelper_WithoutLocation()
 
         var builder = IntermediateNodeBuilder.Create(documentNode);
 
-        builder.Push(new TagHelperIntermediateNode());
+        builder.Push(new TagHelperIntermediateNode()
+        {
+            TagMode = 0,
+            TagName = "Test"
+        });
 
         // Act
         ProjectEngine.ExecutePass<InstrumentationPass>(codeDocument, documentNode);