Add f16 and f128 to rustdoc's PrimitiveType

Fix a few places where these primitives were missing from librustdoc.

Author: tgross35

src/librustdoc/clean/types.rs

@@ -1797,8 +1797,10 @@ impl PrimitiveType {
             sym::bool => Some(PrimitiveType::Bool),
             sym::char => Some(PrimitiveType::Char),
             sym::str => Some(PrimitiveType::Str),
+            sym::f16 => Some(PrimitiveType::F16),
             sym::f32 => Some(PrimitiveType::F32),
             sym::f64 => Some(PrimitiveType::F64),
+            sym::f128 => Some(PrimitiveType::F128),
             sym::array => Some(PrimitiveType::Array),
             sym::slice => Some(PrimitiveType::Slice),
             sym::tuple => Some(PrimitiveType::Tuple),
@@ -1831,8 +1833,10 @@ impl PrimitiveType {
                 U32 => single(SimplifiedType::Uint(UintTy::U32)),
                 U64 => single(SimplifiedType::Uint(UintTy::U64)),
                 U128 => single(SimplifiedType::Uint(UintTy::U128)),
+                F16 => single(SimplifiedType::Float(FloatTy::F16)),
                 F32 => single(SimplifiedType::Float(FloatTy::F32)),
                 F64 => single(SimplifiedType::Float(FloatTy::F64)),
+                F128 => single(SimplifiedType::Float(FloatTy::F128)),
                 Str => single(SimplifiedType::Str),
                 Bool => single(SimplifiedType::Bool),
                 Char => single(SimplifiedType::Char),

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -536,8 +536,10 @@ impl<'a, 'tcx> LinkCollector<'a, 'tcx> {
             I64 => tcx.types.i64,
             I128 => tcx.types.i128,
             Isize => tcx.types.isize,
+            F16 => tcx.types.f16,
             F32 => tcx.types.f32,
             F64 => tcx.types.f64,
+            F128 => tcx.types.f128,
             U8 => tcx.types.u8,
             U16 => tcx.types.u16,
             U32 => tcx.types.u32,
@@ -2196,8 +2198,10 @@ fn resolve_primitive(path_str: &str, ns: Namespace) -> Option<Res> {
         "u32" => U32,
         "u64" => U64,
         "u128" => U128,
+        "f16" => F16,
         "f32" => F32,
         "f64" => F64,
+        "f128" => F128,
         "char" => Char,
         "bool" | "true" | "false" => Bool,
         "str" | "&str" => Str,