Do not emit double values at their use sites.

test/mjsunit/regress/regress-234101.js

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 // Flags: --allow-natives-syntax
 
-function foo(word, nBits) {
-  return (word[1] >>> nBits) | (word[0] << (32 - nBits));
+// Currently, the gap resolver doesn't handle moves from a ConstantOperand to a
+// DoubleRegister, but these kind of moves appeared when HConstant::EmitAtUses
+// was changed to allow special double values (-0, NaN, hole). So we should
+// either enhance the gap resolver or make sure that such moves don't happen.
+
+function foo(x) {
+ return (x ? NaN : 0.2) + 0.1;
 }
 
-word = [0x1001, 0];
-
-var expected = foo(word, 1);
-foo(word, 1);
+foo(false);
+foo(false);
 %OptimizeFunctionOnNextCall(foo);
-var optimized = foo(word, 1);
-assertEquals(expected, optimized)
+foo(false);