glsl: Implement GLSL 1.30's literal integer range restrictions.

From page 22 (28 of PDF) of GLSL 1.30 spec:
    It is an error to provide a literal integer whose magnitude is too
    large to store in a variable of matching signed or unsigned type.

    Unsigned integers have exactly 32 bits of precision.  Signed integers
    use 32 bits, including a sign bit, in two's complement form.

Fixes piglit int-literal-too-large-0[123].frag.

v2: Take care with INT_MIN, use stroull, and make it a function.

Reviewed-by: Paul Berry <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

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