Map ".text.hot" and ".text.unlikely" input section prefixes to separate output sections.

[Ian Lance Taylor]

Sriraman Tallam <tmsriram@google.com> writes:

>   Sections prefixed with ".text.hot", ".text.unlikely" and
> ".text.startup" should map to separate output sections so that they
> can be grouped together. The following simple patch does this. Alright
> to submit?

The GNU linker puts all .text.hot input sections into the .text output
section.  It just groups them together.  I would prefer to do that in
gold, too.  Your patch would create a .text.hot output section, which is
not what I would like to see.

Ideally gold should group all input sections with the same name
together, regardless of what output section they are going to.  I
believe this can be done in Output_section::add_input_section if we
preserve the name in Input_section_list.  The main drawback is that this
may mean giving up on the current optimization of not building an
Input_section_list.

Ian