[regexp] fix regexp lookbehind with back reference on ARM.

BUG=chromium:695416

Change-Id: Ied3a389d0dfb0132c798bc85e10f7b1fd4432eb4
Reviewed-on: https://chromium-review.googlesource.com/446343Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43435}

src/regexp/arm/regexp-macro-assembler-arm.cc

@@ -368,7 +368,7 @@ void RegExpMacroAssemblerARM::CheckNotBackReference(int start_reg,
     __ ldr(r3, MemOperand(frame_pointer(), kStringStartMinusOne));
     __ add(r3, r3, r1);
     __ cmp(current_input_offset(), r3);
-    BranchOrBacktrack(lt, on_no_match);
+    BranchOrBacktrack(le, on_no_match);
   } else {
     __ cmn(r1, Operand(current_input_offset()));
     BranchOrBacktrack(gt, on_no_match);

src/regexp/ppc/regexp-macro-assembler-ppc.cc

@@ -387,7 +387,7 @@ void RegExpMacroAssemblerPPC::CheckNotBackReference(int start_reg,
     __ LoadP(r6, MemOperand(frame_pointer(), kStringStartMinusOne));
     __ add(r6, r6, r4);
     __ cmp(current_input_offset(), r6);
-    BranchOrBacktrack(lt, on_no_match);
+    BranchOrBacktrack(le, on_no_match);
   } else {
     __ add(r0, r4, current_input_offset(), LeaveOE, SetRC);
     BranchOrBacktrack(gt, on_no_match, cr0);

src/regexp/s390/regexp-macro-assembler-s390.cc

@@ -376,7 +376,7 @@ void RegExpMacroAssemblerS390::CheckNotBackReference(int start_reg,
     __ LoadP(r5, MemOperand(frame_pointer(), kStringStartMinusOne));
     __ AddP(r5, r5, r3);
     __ CmpP(current_input_offset(), r5);
-    BranchOrBacktrack(lt, on_no_match);
+    BranchOrBacktrack(le, on_no_match);
   } else {
     __ AddP(r0, r3, current_input_offset());
     BranchOrBacktrack(gt, on_no_match, cr0);

test/mjsunit/harmony/regexp-lookbehind.js

@@ -157,6 +157,7 @@ assertEquals(["abc", "abc"], /(abc\1)/i.exec("abc\u1234"));
 var oob_subject = "abcdefghijklmnabcdefghijklmn".substr(14);
 assertNull(oob_subject.match(/(?=(abcdefghijklmn))(?<=\1)a/i));
 assertNull(oob_subject.match(/(?=(abcdefghijklmn))(?<=\1)a/));
+assertNull("abcdefgabcdefg".substr(1).match(/(?=(abcdefg))(?<=\1)/));
 
 // Mutual recursive capture/back references
 assertEquals(["cacb", "a", ""], /(?<=a(.\2)b(\1)).{4}/.exec("aabcacbc"));