Scalar vector binary operation

[Artem Shinkarov]

This patch allows binary operations: "vector <op> scalar" and "scalar
<op> vector" in which case scalar is converted into the vector type,
if the scalar type fits in the vectors element type.

ChangeLog:

2010-11-01  Artjoms Sinkarovs <artyom.shinakroff@gmail.com>

       /gcc
       * tree.c (build_vector_from_val): Build vector from scalar
       * tree.h (build_vector_from_val): New declaration
       * c-typeck.c (expr_fits_type_p): New function. Check if expression
       fits into the type considering constants.
       (scalar_to_vector): New function. Try scalar to vector conversion.
       (build_binary_op): Adjust.
       * doc/extend.texi: Description of scalar to vector expansion.

       /gcc/testsuite
       * gcc.c-torture/execute/scal-to-vec1.c: New test.
       * gcc.dg/scal-to-vec1.c: New test.

bootstrapped and tested on x86_64_unknown-linux

OK?
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