Use a more reliable method to dinstinguish between an op_call and an op_construct

The two opcode operand looks like this.

      -7        -6       -5       -4           -3          -2            -1
  op_construct dst(r) func(r) argCount(n) registerOffset(n) proto(r) thisRegister(r)
                      op_call   dst(r)        func(r)     argCount(n) registerOffset(n)

as the registerOffset must always be bigger than any register we can
use that knoweldge to differenciate the two calls

Note that this is only the fallback used for JavaScript function. native
function still uses the QScriptActivationObject

Reviewed-by: Kent Hansen

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