Overloaded function members don't have to appear side-by-side

[samhh]

For example the following is valid:

export declare function f(): string

export declare const x: number

export declare function f(): boolean

The output should group the fs together.

[samhh]

d66356b#diff-d9b843b0d22ae50d45bf376cde4623f28e353d256fa4cc506dd554b13dab76f3R127