[regexp] fix interpreted irregexp build.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/1595403003

Cr-Commit-Position: refs/heads/master@{#33354}

src/regexp/regexp-macro-assembler-irregexp.h

@@ -82,6 +82,12 @@ class RegExpMacroAssemblerIrregexp: public RegExpMacroAssembler {
                                         uc16 to,
                                         Label* on_not_in_range);
   virtual void CheckBitInTable(Handle<ByteArray> table, Label* on_bit_set);
+  virtual void CheckPosition(int cp_offset, Label* on_outside_input) {
+    LoadCurrentCharacter(cp_offset, on_outside_input, true);
+  }
+  virtual bool CheckSpecialCharacterClass(uc16 type, Label* on_no_match) {
+    return false;  // No custom support for character classes.
+  }
   virtual void CheckNotBackReference(int start_reg, bool read_backward,
                                      Label* on_no_match);
   virtual void CheckNotBackReferenceIgnoreCase(int start_reg,

test/webkit/webkit.status

@@ -38,6 +38,8 @@
   # This test leads to a SyntaxError from conflicting let declarations
   # in ES2015
   'function-declarations-in-switch-statement': [FAIL],
+  # Irregexp interpreter overflows stack. We should just not crash.
+  'fast/js/regexp-stack-overflow': [PASS, FAIL],
 }],  # ALWAYS
 ['mode == debug', {
   # Too slow in debug mode.