Tweak to shorten generated code in Math.pow.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index d87a439007e6a1f89525dc72571094742e62f373..08bbbc036d638c065bb0c71585259644d579f435 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -3130,11 +3130,9 @@ void MathPowStub::Generate(MacroAssembler* masm) {
   __ movsd(double_scratch2, double_result);  // Load double_exponent with 1.
 
   // Get absolute value of exponent.
-  Label no_neg, while_true, no_multiply;
-  __ cmp(exponent, 0);
-  __ j(greater_equal, &no_neg, Label::kNear);
-  __ neg(exponent);
-  __ bind(&no_neg);
+  Label while_true, no_multiply;
+  const uint32_t kClearSignBitMask = 0x7FFFFFFF;
+  __ and_(exponent, Immediate(kClearSignBitMask));
 
   __ bind(&while_true);
   __ shr(exponent, 1);