Revert "Changing string length field type from int to SMI."

src/arm/stub-cache-arm.cc

Index: src/arm/stub-cache-arm.cc
diff --git a/src/arm/stub-cache-arm.cc b/src/arm/stub-cache-arm.cc
index 65eff8e109cb6c988142071f90fd19a017f72cd1..a770d160f028bc76314a2f0c24f517400f84fd74 100644
--- a/src/arm/stub-cache-arm.cc
+++ b/src/arm/stub-cache-arm.cc
@@ -229,6 +229,7 @@ void StubCompiler::GenerateLoadStringLength(MacroAssembler* masm,
 
   // Load length directly from the string.
   __ ldr(r0, FieldMemOperand(receiver, String::kLengthOffset));
+  __ mov(r0, Operand(r0, LSL, kSmiTagSize));
   __ Ret();
 
   // Check if the object is a JSValue wrapper.
@@ -240,6 +241,7 @@ void StubCompiler::GenerateLoadStringLength(MacroAssembler* masm,
   __ ldr(scratch1, FieldMemOperand(receiver, JSValue::kValueOffset));
   GenerateStringCheck(masm, scratch1, scratch2, scratch2, miss, miss);
   __ ldr(r0, FieldMemOperand(scratch1, String::kLengthOffset));
+  __ mov(r0, Operand(r0, LSL, kSmiTagSize));
   __ Ret();
 }