Crankshaft: Recognize (i >>> 0) === i for integer32 inputs and replace

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
===================================================================
--- src/ia32/lithium-codegen-ia32.cc	(revision 14364)
+++ src/ia32/lithium-codegen-ia32.cc	(working copy)
@@ -1692,11 +1692,11 @@
     uint8_t shift_count = static_cast<uint8_t>(value & 0x1F);
     switch (instr->op()) {
       case Token::ROR:
-        if (shift_count == 0 && instr->can_deopt()) {
+        if (shift_count != 0) {
+          __ ror(ToRegister(left), shift_count);
+        } else if (instr->can_deopt()) {
           __ test(ToRegister(left), Immediate(0x80000000));
           DeoptimizeIf(not_zero, instr->environment());
-        } else {
-          __ ror(ToRegister(left), shift_count);
         }
         break;
       case Token::SAR:
@@ -1705,11 +1705,11 @@
         }
         break;
       case Token::SHR:
-        if (shift_count == 0 && instr->can_deopt()) {
+        if (shift_count != 0) {
+          __ shr(ToRegister(left), shift_count);
+        } else if (instr->can_deopt()) {
           __ test(ToRegister(left), Immediate(0x80000000));
           DeoptimizeIf(not_zero, instr->environment());
-        } else {
-          __ shr(ToRegister(left), shift_count);
         }
         break;
       case Token::SHL: