Fixing a performance bug introduced in r4581.

Review URL: http://codereview.chromium.org/1910005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4605 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/codegen-arm.cc

@@ -8522,9 +8522,9 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
   // string length. A negative value will be greater (unsigned comparison).
   __ ldr(r0, MemOperand(sp, kPreviousIndexOffset));
   __ tst(r0, Operand(kSmiTagMask));
-  __ b(eq, &runtime);
+  __ b(ne, &runtime);
   __ cmp(r3, Operand(r0));
-  __ b(le, &runtime);
+  __ b(ls, &runtime);
 
   // r2: Number of capture registers
   // subject: Subject string

src/ia32/codegen-ia32.cc

@@ -10956,7 +10956,7 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
   // string length. A negative value will be greater (unsigned comparison).
   __ mov(eax, Operand(esp, kPreviousIndexOffset));
   __ test(eax, Immediate(kSmiTagMask));
-  __ j(zero, &runtime);
+  __ j(not_zero, &runtime);
   __ cmp(eax, Operand(ebx));
   __ j(above_equal, &runtime);