[clang] [llvm] [LLVM] Rename `Type::getTruncatedType()` and `Type::getExtendedType()` (PR #196528)

[Sergei Barannikov via cfe-commits]

s-barannikov wrote:

> > > "double width" is ambiguous wrt doubling the scalar width or doubling the type width
> > 
> > 
> > It is actually "double width element". I would agree otherwise.
> 
> The main APIs (on Type rather than on VectorType / IntegerType) are called getDoubleWidthType() and getHalfWidthType().

Right... I should have looked more closely.

https://github.com/llvm/llvm-project/pull/196528