saturating arithmetic modifications

 * Remove the builtins `@addWithSaturation`, `@subWithSaturation`,
   `@mulWithSaturation`, and `@shlWithSaturation` now that we have
   first-class syntax for saturating arithmetic.
 * langref: Clarify the behavior of `@shlExact`.
 * Ast: rename `bit_shift_left` to `shl` and `bit_shift_right` to `shr`
   for consistency.
 * Air: rename to include underscore separator with consistency with
   the rest of the ops.
 * Air: add shl_exact instruction
 * Use non-extended tags for saturating arithmetic, to keep it
   simple so that all the arithmetic operations can be done the same
   way.
   - Sema: unify analyzeArithmetic with analyzeSatArithmetic
     - implement comptime `+|`, `-|`, and `*|`
     - allow float operands to saturating arithmetic
 * `<<|` allows any integer type for the RHS.
 * C backend: fix rebase conflicts
 * LLVM backend: reduce the amount of branching for arithmetic ops
 * zig.h: fix magic number not matching actual size of C integer types

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