Range Analysis: Compute range of built-in call `min`

This patch computes the range of a core built-in call `min`.
- When both `a` and `b` are constant values, the range of
  `min(a, b)` will also be a constant value.
- When the range of `a` is [min1, max1] and the range of `b` is
  [min2, max2], the range of min(a, b) is `[min(min1, min2),
  min(max1, max2)]`.
- The ranges that represent the whole range of `i32` or `u32`
  are treated as invalid ones (e.g. min(a, i32::kHighestValue))

Bug: 348701956
Test: tint_unittests
Change-Id: Ifc67d12b23a7f3ba77250c8857bc5e9147db23b9
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/251594
Commit-Queue: David Neto <dneto@google.com>
Reviewed-by: David Neto <dneto@google.com>