x86/entry: Unbreak __irqentry_text_start/end magic

The entry rework moved interrupt entry code from the irqentry to the
noinstr section which made the irqentry section empty.

This breaks boundary checks which rely on the __irqentry_text_start/end
markers to find out whether a function in a stack trace is
interrupt/exception entry code. This affects the function graph tracer and
filter_irq_stacks().

As the IDT entry points are all sequentialy emitted this is rather simple
to unbreak by injecting __irqentry_text_start/end as global labels.

To make this work correctly:

  - Remove the IRQENTRY_TEXT section from the x86 linker script
  - Define __irqentry so it breaks the build if it's used
  - Adjust the entry mirroring in PTI
  - Remove the redundant kprobes and unwinder bound checks

Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/mm/pti.c

@@ -492,12 +492,12 @@ static void __init pti_setup_espfix64(void)
 }
 
 /*
- * Clone the populated PMDs of the entry and irqentry text and force it RO.
+ * Clone the populated PMDs of the entry text and force it RO.
  */
 static void pti_clone_entry_text(void)
 {
 	pti_clone_pgtable((unsigned long) __entry_text_start,
-			  (unsigned long) __irqentry_text_end,
+			  (unsigned long) __entry_text_end,
 			  PTI_CLONE_PMD);
 }