JSC_NEGATING_A_NON_NUMBER_ERROR not reported consistantly

[blickly]

This issue was imported from Closure Compiler's previous home at http://closure-compiler.googlecode.com

The original discussion is archived at: http://blickly.github.io/closure-compiler-issues/#1158

[Dominator008]

-new Array(2, String);

is folded to

-[2, String];

while

-new Array(2, 'String');

is folded to

NaN;