[BOLT][test] Fix instrumentation tests for X86 (add .init entries)

Author: Vasily Leonenko

bolt/test/X86/internal-call-instrument-so.s

@@ -5,7 +5,7 @@
 # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s -o %t.o
 # Delete our BB symbols so BOLT doesn't mark them as entry points
 # RUN: llvm-strip --strip-unneeded %t.o
-# RUN: ld.lld %t.o -o %t.exe -q -shared -fini=_fini
+# RUN: ld.lld %t.o -o %t.exe -q -shared -fini=_fini -init=_init
 # RUN: llvm-bolt --instrument %t.exe --relocs -o %t.out
 
   .text
@@ -48,6 +48,13 @@ _fini:
   hlt
   .size _fini, .-_fini
 
+  .globl  _init
+  .type _init, %function
+  .p2align  4
+_init:
+  retq
+  .size _init, .-_init
+
   .data
   .globl var
 var:

bolt/test/runtime/X86/instrument-wrong-target.s

@@ -19,6 +19,13 @@ _start:
     ret
     .size _start, .-_start
 
+    .globl _init
+    .type _init, %function
+    # Force DT_INIT to be created (needed for instrumentation).
+_init:
+    ret
+    .size _init, .-_init
+
     .globl _fini
     .type _fini, %function
     # Force DT_FINI to be created (needed for instrumentation).