Limit end-anchored regexps to testing end of string where possible.

src/interpreter-irregexp.cc

Index: src/interpreter-irregexp.cc
diff --git a/src/interpreter-irregexp.cc b/src/interpreter-irregexp.cc
index a904447f37215bfad8f0bfa67a23c224d4ac788f..c9c3cc4c0eb712837d3cd40893851e3c2751c2e1 100644
--- a/src/interpreter-irregexp.cc
+++ b/src/interpreter-irregexp.cc
@@ -607,6 +607,15 @@ static bool RawMatch(const byte* code_base,
           pc = code_base + Load32Aligned(pc + 4);
         }
         break;
+      BYTECODE(SET_CURRENT_POSITION_FROM_END) {
+        int by = static_cast<uint32_t>(insn) >> BYTECODE_SHIFT;
+        if (subject.length() - current > by) {
+          current = subject.length() - by;
+          current_char = subject[current - 1];
+        }
+        pc += BC_SET_CURRENT_POSITION_FROM_END_LENGTH;
+        break;
+      }
       default:
         UNREACHABLE();
         break;