Add support for Float16, Float32, Float64 and Float128

Upgrade libgccjit.version

Limit new Floatxx types to master branch only

apply rustfmt

Make new types available only when requested

libgccjit.version

@@ -1 +1 @@
-b6f163f52
+ab469a6daaed9f4191ac8c32894b3f44d78b2ba5

src/type_.rs

@@ -1,4 +1,4 @@
-use gccjit::{RValue, Struct, Type};
+use gccjit::{CType, RValue, Struct, Type};
 use rustc_codegen_ssa::common::TypeKind;
 use rustc_codegen_ssa::traits::{BaseTypeMethods, DerivedTypeMethods, TypeMembershipMethods};
 use rustc_middle::ty::layout::TyAndLayout;
@@ -120,8 +120,13 @@ impl<'gcc, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
         self.isize_type
     }
 
+    #[cfg(feature = "master")]
     fn type_f16(&self) -> Type<'gcc> {
-        unimplemented!("f16_f128")
+        self.context.new_c_type(CType::Float16)
+    }
+    #[cfg(not(feature = "master"))]
+    fn type_f16(&self) -> Type<'gcc> {
+        unimplemented!("f16")
     }
 
     fn type_f32(&self) -> Type<'gcc> {
@@ -132,8 +137,13 @@ impl<'gcc, 'tcx> BaseTypeMethods<'tcx> for CodegenCx<'gcc, 'tcx> {
         self.double_type
     }
 
+    #[cfg(feature = "master")]
+    fn type_f128(&self) -> Type<'gcc> {
+        self.context.new_c_type(CType::Float128)
+    }
+    #[cfg(not(feature = "master"))]
     fn type_f128(&self) -> Type<'gcc> {
-        unimplemented!("f16_f128")
+        unimplemented!("f128")
     }
 
     fn type_func(&self, params: &[Type<'gcc>], return_type: Type<'gcc>) -> Type<'gcc> {