Add continue statement type determination.

This CL adds type determination for the continue statement.

Bug: tint:5
Change-Id: Ie63994146978d8783f131299b576fc46a10878ad
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/18831
Reviewed-by: David Neto <dneto@google.com>

src/type_determiner.cc

@@ -17,6 +17,7 @@
 #include "src/ast/assignment_statement.h"
 #include "src/ast/break_statement.h"
 #include "src/ast/case_statement.h"
+#include "src/ast/continue_statement.h"
 #include "src/ast/scalar_constructor_expression.h"
 #include "src/ast/type_constructor_expression.h"
 
@@ -85,6 +86,10 @@ bool TypeDeterminer::DetermineResultType(ast::Statement* stmt) {
     auto c = stmt->AsCase();
     return DetermineResultType(c->body());
   }
+  if (stmt->IsContinue()) {
+    auto c = stmt->AsContinue();
+    return DetermineResultType(c->conditional());
+  }
 
   error_ = "unknown statement type for type determination";
   return false;

src/type_determiner_test.cc

@@ -21,6 +21,7 @@
 #include "src/ast/assignment_statement.h"
 #include "src/ast/break_statement.h"
 #include "src/ast/case_statement.h"
+#include "src/ast/continue_statement.h"
 #include "src/ast/float_literal.h"
 #include "src/ast/int_literal.h"
 #include "src/ast/scalar_constructor_expression.h"
@@ -105,6 +106,20 @@ TEST_F(TypeDeterminerTest, Stmt_Case) {
   EXPECT_TRUE(rhs_ptr->result_type()->IsF32());
 }
 
+TEST_F(TypeDeterminerTest, Stmt_Continue) {
+  ast::type::I32Type i32;
+
+  auto cond = std::make_unique<ast::ScalarConstructorExpression>(
+      std::make_unique<ast::IntLiteral>(&i32, 2));
+  auto cond_ptr = cond.get();
+
+  ast::ContinueStatement stmt(ast::StatementCondition::kIf, std::move(cond));
+
+  EXPECT_TRUE(td()->DetermineResultType(&stmt));
+  ASSERT_NE(cond_ptr->result_type(), nullptr);
+  EXPECT_TRUE(cond_ptr->result_type()->IsI32());
+}
+
 TEST_F(TypeDeterminerTest, Expr_Constructor_Scalar) {
   ast::type::F32Type f32;
   ast::ScalarConstructorExpression s(