Rename Index and Member builder helpers.

This CL renames Index to IndexAccessor and Member to MemberAccessor.
This keeps the naming consistent and makes room to use Member for
StructMember.

Change-Id: Icbba3a39ed5e079cd83d8f512fff69494dfac10d
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/35824
Auto-Submit: dan sinclair <dsinclair@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
diff --git a/src/writer/hlsl/generator_impl_array_accessor_test.cc b/src/writer/hlsl/generator_impl_array_accessor_test.cc
index 7e628fd..fc71b74 100644
--- a/src/writer/hlsl/generator_impl_array_accessor_test.cc
+++ b/src/writer/hlsl/generator_impl_array_accessor_test.cc
@@ -30,14 +30,14 @@
 using HlslGeneratorImplTest_Expression = TestHelper;
 
 TEST_F(HlslGeneratorImplTest_Expression, EmitExpression_ArrayAccessor) {
-  auto* expr = Index("ary", 5);
+  auto* expr = IndexAccessor("ary", 5);
 
   ASSERT_TRUE(gen.EmitExpression(pre, out, expr)) << gen.error();
   EXPECT_EQ(result(), "ary[5]");
 }
 
 TEST_F(HlslGeneratorImplTest_Expression, EmitArrayAccessor) {
-  auto* expr = Index("ary", "idx");
+  auto* expr = IndexAccessor("ary", "idx");
 
   ASSERT_TRUE(gen.EmitExpression(pre, out, expr)) << gen.error();
   EXPECT_EQ(result(), "ary[idx]");