Change namespace of tint::type

Move the `tint::type` namespace into `tint::core::type` to better match
the source location and contents.

Change-Id: I2e1ae0ecdffdfcedb8aab1391cdfe2e1453a4741
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/145901
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
diff --git a/src/tint/lang/wgsl/sem/value_expression.cc b/src/tint/lang/wgsl/sem/value_expression.cc
index a5cb212..0e05199 100644
--- a/src/tint/lang/wgsl/sem/value_expression.cc
+++ b/src/tint/lang/wgsl/sem/value_expression.cc
@@ -25,7 +25,7 @@
 namespace tint::sem {
 
 ValueExpression::ValueExpression(const ast::Expression* declaration,
-                                 const type::Type* type,
+                                 const core::type::Type* type,
                                  core::EvaluationStage stage,
                                  const Statement* statement,
                                  const core::constant::Value* constant,