spirv: Rewrite determinant calculation
The old calculation for mat3 was clever, but it turns out that a straightforward application of subdeterminants similar to how mat4 is handled is more efficient: on a scalar architecture with some sort of combined multiply+add instruction with a negate modifier (both fairly common), the new determinant is 9 instructions vs. 15 for the old one, and without the multiply-add it's 14 instructions vs. 18 for the old one. When used as a routine for inverse() the savings are compounded, because we now use the same method as used to compute the adjucate matrix and so CSE can combine most of the calculations with the adjucate matrix ones. Once mat3 and mat4 use the same method for computing determinants, we can combine them into a single recursive function. I also pulled up the mat_subdet() function because it was doing basically what we need, so it's now shared between determinant and inverse. This shrinks the implementation significantly, as can be seen from the diffstat. The real reason I want to change this, though, is that it fixes dEQP-VK.glsl.builtin.precision_fp16_storage16b.inverse.compute.mat3 with turnip. Qualcomm uses round-to-zero for 16-bit frcp, which combined with some inaccuracy in the old method of calculating the determinant led us to fail. Qualcomm's driver uses something like the new method to calculate the determinant in the inverse. We could argue that Mesa's method should be allowed, because round-to-zero for floating-point division is within spec and there are no precision guarantees given for determinant() or inverse(). However we might as well use the more efficient method.