x86: merge .text.* into .text while linking

For xen.efi, this eliminates a pointless gap between .text and
.text.unlikely of almost 2Mb size.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -47,6 +47,8 @@ SECTIONS
   .text : {
         _stext = .;            /* Text and read-only data */
        *(.text)
+       *(.text.cold)
+       *(.text.unlikely)
        *(.fixup)
        *(.gnu.warning)
        _etext = .;             /* End of text section */