Add f16 and f128 to rustc_type_ir::FloatTy and rustc_abi::Primitive

Make changes necessary to support these types in the compiler.

compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs

@@ -695,9 +695,13 @@ impl MsvcBasicName for ty::UintTy {
 
 impl MsvcBasicName for ty::FloatTy {
     fn msvc_basic_name(self) -> &'static str {
+        // FIXME: f16 and f128 have no MSVE representation. We could improve the debuginfo.
+        // See: <https://github.com/rust-lang/rust/pull/114607/files#r1454683264>
         match self {
+            ty::FloatTy::F16 => "half",
             ty::FloatTy::F32 => "float",
             ty::FloatTy::F64 => "double",
+            ty::FloatTy::F128 => "fp128",
         }
     }
 }

compiler/rustc_codegen_llvm/src/debuginfo/metadata/enums/mod.rs

@@ -122,8 +122,10 @@ fn tag_base_type<'ll, 'tcx>(
             // Niche tags are always normalized to unsized integers of the correct size.
             match tag.primitive() {
                 Primitive::Int(t, _) => t,
+                Primitive::F16 => Integer::I16,
                 Primitive::F32 => Integer::I32,
                 Primitive::F64 => Integer::I64,
+                Primitive::F128 => Integer::I128,
                 // FIXME(erikdesjardins): handle non-default addrspace ptr sizes
                 Primitive::Pointer(_) => {
                     // If the niche is the NULL value of a reference, then `discr_enum_ty` will be