Fix -Wsign-compare warnings in parser, scanner, regexp, runtime.

test/unittests/source-position-table-unittest.cc

Index: test/unittests/source-position-table-unittest.cc
diff --git a/test/unittests/source-position-table-unittest.cc b/test/unittests/source-position-table-unittest.cc
index 01d96750614fe1f86b91dff86f8aa44f0a30b815..b1d63aa3dde7f014224ffabf9866f723a6444168 100644
--- a/test/unittests/source-position-table-unittest.cc
+++ b/test/unittests/source-position-table-unittest.cc
@@ -25,7 +25,7 @@ static int offsets[] = {0,   1,   2,    3,    4,     30,      31,  32,
 
 TEST_F(SourcePositionTableTest, EncodeStatement) {
   SourcePositionTableBuilder builder(zone());
-  for (int i = 0; i < arraysize(offsets); i++) {
+  for (size_t i = 0; i < arraysize(offsets); i++) {
     builder.AddPosition(offsets[i], offsets[i], true);
   }
 
@@ -37,7 +37,7 @@ TEST_F(SourcePositionTableTest, EncodeStatement) {
 
 TEST_F(SourcePositionTableTest, EncodeStatementDuplicates) {
   SourcePositionTableBuilder builder(zone());
-  for (int i = 0; i < arraysize(offsets); i++) {
+  for (size_t i = 0; i < arraysize(offsets); i++) {
     builder.AddPosition(offsets[i], offsets[i], true);
     builder.AddPosition(offsets[i], offsets[i] + 1, true);
   }
@@ -50,7 +50,7 @@ TEST_F(SourcePositionTableTest, EncodeStatementDuplicates) {
 
 TEST_F(SourcePositionTableTest, EncodeExpression) {
   SourcePositionTableBuilder builder(zone());
-  for (int i = 0; i < arraysize(offsets); i++) {
+  for (size_t i = 0; i < arraysize(offsets); i++) {
     builder.AddPosition(offsets[i], offsets[i], false);
   }
   CHECK(!builder.ToSourcePositionTable(isolate(), Handle<AbstractCode>())
@@ -62,7 +62,7 @@ TEST_F(SourcePositionTableTest, EncodeAscending) {
 
   int code_offset = 0;
   int source_position = 0;
-  for (int i = 0; i < arraysize(offsets); i++) {
+  for (size_t i = 0; i < arraysize(offsets); i++) {
     code_offset += offsets[i];
     source_position += offsets[i];
     if (i % 2) {
@@ -73,7 +73,7 @@ TEST_F(SourcePositionTableTest, EncodeAscending) {
   }
 
   // Also test negative offsets for source positions:
-  for (int i = 0; i < arraysize(offsets); i++) {
+  for (size_t i = 0; i < arraysize(offsets); i++) {
     code_offset += offsets[i];
     source_position -= offsets[i];
     if (i % 2) {