Fix Internal Compiler error: cast<X>() argument of incompatible type!…

[fengliancanxue]

… (#7016)

-fix max( min16float4 (0,0,0,0), min16float4 (0,0,0,0)) compile error

[fengliancanxue]

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[damyanp]

@llvm-beanz / @bob80905 / @pow2clk - can you provide some guidance on ways to go about testing this? I think the current test is of the form "doesn't crash", but maybe there's something more explicit that could be tested here?