Guarantee soundness of pointer-to-int transmutes

Define raw pointer transmute behavior

[type-layout] Document bit validity of structs and padding

Update type-layout.md based on Ralf's feedback

Update type-layout.md

[type-layout] Document minimum size and alignment

type-layout.md: Guarantee that repr(C) enum discriminants are stable …

type-layout.md: Warn about repr(align)/repr(packed) and field order

Remove extra blank lines.

Update operator-expr.md

Update src/expressions/operator-expr.md

Update operator-expr.md

Update type-coercions.md

Update operator-expr.md

Guarantee that raw pointer conversions preserve slice element count

Guarantee char layout

Update pointer.md

Apply suggestions from code review

Update type-layout.md

Update pointer.md

Update numeric.md

Update textual.md

Update boolean.md

Update type-layout.md

Update src/type-layout.md

Update type-layout.md