[BOLT][TEST] Fix test failures on AArch64 builder

Address X86 tests failures on AArch64 builder:
https://lab.llvm.org/staging/#/builders/211/builds/82

Inputs fail to cross-compile due to a missing header:
```
/usr/include/stdio.h:27:10: fatal error: 'bits/libc-header-start.h' file not found
#include <bits/libc-header-start.h>
```

As inputs are linked with `-nostdlib` anyway, don't include stdio.h.

Reviewed By: yota9

Differential Revision: https://reviews.llvm.org/D124863

bolt/test/Inputs/icf-jump-tables.c

@@ -1,4 +1,4 @@
-#include <stdio.h>
+#include "stub.h"
 
 int inc(int x) {
   switch (x) {

bolt/test/Inputs/stub.c

@@ -4,6 +4,7 @@ void *memcpy(void *dest, const void *src, unsigned long n) { return 0; }
 void *memset(void *dest, int c, unsigned long n) { return 0; }
 int printf(const char *format, ...) { return 0; }
 void exit(int status) {}
+int puts(const char *s) { return 0; }
 
 void *__gxx_personality_v0;
 void *__cxa_allocate_exception;

bolt/test/Inputs/stub.h

@@ -5,5 +5,6 @@ void *memcpy(void *dest, const void *src, unsigned long n);
 void *memset(void *dest, int c, unsigned long n);
 int printf(const char *format, ...);
 void exit(int status);
+int puts(const char *s);
 
 #endif

bolt/test/X86/Inputs/avx512.c

@@ -1,14 +1,9 @@
-#include <stdio.h>
-
 void use_avx512() {
-  printf("after first entry\n");
   asm (".byte 0x62, 0xe2, 0xf5, 0x70, 0x2c, 0xda");
-  asm ("secondary_entry:");
-  printf("after secondary entry\n");
+  asm("secondary_entry:");
 }
 
 int main() {
-  printf("about to use avx-512 instruction...\n");
   use_avx512();
 
   return 0;

bolt/test/X86/Inputs/inline-foo.c

@@ -1,4 +1,4 @@
-#include <stdio.h>
+#include "stub.h"
 
 void foo() {
   puts("Hello world!\n");

bolt/test/X86/inline-debug-info.test

@@ -4,7 +4,7 @@
 # REQUIRES: system-linux
 
 # RUN: %clang %cflags -O1 -g %p/Inputs/inline-main.c %p/Inputs/inline-foo.c \
-# RUN:   -o %t.exe -Wl,-q
+# RUN:   -I%p/../Inputs -o %t.exe -Wl,-q
 # RUN: llvm-bolt %t.exe -update-debug-sections -print-debug-info \
 # RUN:   -print-only=main -print-after-lowering -force-inline=foo -o %t.bolt \
 # RUN:   | FileCheck %s